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<h1 class="title">calculator.js Example File</h1>
<span class="small-subtitle">script/calculator/calculator.js</span>
<!-- $$$script/calculator/calculator.js-description -->
<div class="descr"> <a name="details"></a>
<pre class="js"> <span class="name">Function</span>.<span class="name">prototype</span>.<span class="name">bind</span> <span class="operator">=</span> <span class="keyword">function</span>() {
var <span class="name">func</span> = this;
var <span class="name">thisObject</span> = <span class="name">arguments</span>[<span class="number">0</span>];
var <span class="name">args</span> = <span class="name">Array</span>.<span class="name">prototype</span>.<span class="name">slice</span>.<span class="name">call</span>(<span class="name">arguments</span>, <span class="number">1</span>);
<span class="keyword">return</span> <span class="keyword">function</span>() {
<span class="keyword">return</span> <span class="name">func</span>.<span class="name">apply</span>(<span class="name">thisObject</span>, <span class="name">args</span>);
}
}
<span class="keyword">function</span> <span class="name">Calculator</span>(<span class="name">ui</span>)
{
this.<span class="name">ui</span> <span class="operator">=</span> <span class="name">ui</span>;
this.<span class="name">pendingAdditiveOperator</span> <span class="operator">=</span> <span class="name">Calculator</span>.<span class="name">NO_OPERATOR</span>;
this.<span class="name">pendingMultiplicativeOperator</span> <span class="operator">=</span> <span class="name">Calculator</span>.<span class="name">NO_OPERATOR</span>;
this.<span class="name">sumInMemory</span> <span class="operator">=</span> <span class="number">0</span>;
this.<span class="name">sumSoFar</span> <span class="operator">=</span> <span class="number">0</span>;
this.<span class="name">factorSoFar</span> <span class="operator">=</span> <span class="number">0</span>;
this.<span class="name">waitingForOperand</span> <span class="operator">=</span> <span class="number">true</span>;
<span class="keyword">with</span> (<span class="name">ui</span>) {
<span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="string">"0"</span>;
<span class="name">zeroButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this.<span class="name">digitClicked</span>.<span class="name">bind</span>(this, <span class="number">0</span>));
<span class="name">oneButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this.<span class="name">digitClicked</span>.<span class="name">bind</span>(this, <span class="number">1</span>));
<span class="name">twoButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this.<span class="name">digitClicked</span>.<span class="name">bind</span>(this, <span class="number">2</span>));
<span class="name">threeButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this.<span class="name">digitClicked</span>.<span class="name">bind</span>(this, <span class="number">3</span>));
<span class="name">fourButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this.<span class="name">digitClicked</span>.<span class="name">bind</span>(this, <span class="number">4</span>));
<span class="name">fiveButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this.<span class="name">digitClicked</span>.<span class="name">bind</span>(this, <span class="number">5</span>));
<span class="name">sixButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this.<span class="name">digitClicked</span>.<span class="name">bind</span>(this, <span class="number">6</span>));
<span class="name">sevenButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this.<span class="name">digitClicked</span>.<span class="name">bind</span>(this, <span class="number">7</span>));
<span class="name">eightButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this.<span class="name">digitClicked</span>.<span class="name">bind</span>(this, <span class="number">8</span>));
<span class="name">nineButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this.<span class="name">digitClicked</span>.<span class="name">bind</span>(this, <span class="number">9</span>));
<span class="name">pointButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this, <span class="string">"pointClicked"</span>);
<span class="name">changeSignButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this, <span class="string">"changeSignClicked"</span>);
<span class="name">backspaceButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this, <span class="string">"backspaceClicked"</span>);
<span class="name">clearButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this, <span class="string">"clear"</span>);
<span class="name">clearAllButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this, <span class="string">"clearAll"</span>);
<span class="name">clearMemoryButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this, <span class="string">"clearMemory"</span>);
<span class="name">readMemoryButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this, <span class="string">"readMemory"</span>);
<span class="name">setMemoryButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this, <span class="string">"setMemory"</span>);
<span class="name">addToMemoryButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this, <span class="string">"addToMemory"</span>);
<span class="name">divisionButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this.<span class="name">multiplicativeOperatorClicked</span>.<span class="name">bind</span>(this, <span class="name">Calculator</span>.<span class="name">DIVISION_OPERATOR</span>));
<span class="name">timesButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this.<span class="name">multiplicativeOperatorClicked</span>.<span class="name">bind</span>(this, <span class="name">Calculator</span>.<span class="name">TIMES_OPERATOR</span>));
<span class="name">minusButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this.<span class="name">additiveOperatorClicked</span>.<span class="name">bind</span>(this, <span class="name">Calculator</span>.<span class="name">MINUS_OPERATOR</span>));
<span class="name">plusButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this.<span class="name">additiveOperatorClicked</span>.<span class="name">bind</span>(this, <span class="name">Calculator</span>.<span class="name">PLUS_OPERATOR</span>));
<span class="name">squareRootButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this.<span class="name">unaryOperatorClicked</span>.<span class="name">bind</span>(this, <span class="name">Calculator</span>.<span class="name">SQUARE_OPERATOR</span>));
<span class="name">powerButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this.<span class="name">unaryOperatorClicked</span>.<span class="name">bind</span>(this, <span class="name">Calculator</span>.<span class="name">POWER_OPERATOR</span>));
<span class="name">reciprocalButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this.<span class="name">unaryOperatorClicked</span>.<span class="name">bind</span>(this, <span class="name">Calculator</span>.<span class="name">RECIPROCAL_OPERATOR</span>));
<span class="name">equalButton</span>.<span class="name">clicked</span>.<span class="name">connect</span>(this, <span class="string">"equalClicked"</span>);
}
}
<span class="name">Calculator</span>.<span class="name">NO_OPERATOR</span> <span class="operator">=</span> <span class="number">0</span>;
<span class="name">Calculator</span>.<span class="name">SQUARE_OPERATOR</span> <span class="operator">=</span> <span class="number">1</span>;
<span class="name">Calculator</span>.<span class="name">POWER_OPERATOR</span> <span class="operator">=</span> <span class="number">2</span>;
<span class="name">Calculator</span>.<span class="name">RECIPROCAL_OPERATOR</span> <span class="operator">=</span> <span class="number">3</span>;
<span class="name">Calculator</span>.<span class="name">DIVISION_OPERATOR</span> <span class="operator">=</span> <span class="number">4</span>;
<span class="name">Calculator</span>.<span class="name">TIMES_OPERATOR</span> <span class="operator">=</span> <span class="number">5</span>;
<span class="name">Calculator</span>.<span class="name">MINUS_OPERATOR</span> <span class="operator">=</span> <span class="number">6</span>;
<span class="name">Calculator</span>.<span class="name">PLUS_OPERATOR</span> <span class="operator">=</span> <span class="number">7</span>;
<span class="name">Calculator</span>.<span class="name">prototype</span>.<span class="name">abortOperation</span> <span class="operator">=</span> <span class="keyword">function</span>()
{
this.<span class="name">clearAll</span>();
this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="string">"####"</span>;
}
<span class="name">Calculator</span>.<span class="name">prototype</span>.<span class="name">calculate</span> <span class="operator">=</span> <span class="keyword">function</span>(<span class="name">rightOperand</span>, pendingOperator)
{
<span class="keyword">if</span> (<span class="name">pendingOperator</span> <span class="operator">==</span> <span class="name">Calculator</span>.<span class="name">PLUS_OPERATOR</span>) {
this.<span class="name">sumSoFar</span> <span class="operator">+=</span> <span class="name">rightOperand</span>;
} else <span class="keyword">if</span> (<span class="name">pendingOperator</span> <span class="operator">==</span> <span class="name">Calculator</span>.<span class="name">MINUS_OPERATOR</span>) {
this.<span class="name">sumSoFar</span> <span class="operator">-=</span> <span class="name">rightOperand</span>;
} else <span class="keyword">if</span> (<span class="name">pendingOperator</span> <span class="operator">==</span> <span class="name">Calculator</span>.<span class="name">TIMES_OPERATOR</span>) {
this.<span class="name">factorSoFar</span> <span class="operator">*=</span> <span class="name">rightOperand</span>;
} else <span class="keyword">if</span> (<span class="name">pendingOperator</span> <span class="operator">==</span> <span class="name">Calculator</span>.<span class="name">DIVISION_OPERATOR</span>) {
<span class="keyword">if</span> (<span class="name">rightOperand</span> <span class="operator">==</span> <span class="number">0</span>)
<span class="keyword">return</span> <span class="number">false</span>;
this.<span class="name">factorSoFar</span> <span class="operator">/=</span> <span class="name">rightOperand</span>;
}
<span class="keyword">return</span> <span class="number">true</span>;
}
<span class="name">Calculator</span>.<span class="name">prototype</span>.<span class="name">digitClicked</span> <span class="operator">=</span> <span class="keyword">function</span>(<span class="name">digitValue</span>)
{
<span class="keyword">if</span> ((<span class="name">digitValue</span> <span class="operator">==</span> <span class="number">0</span>) <span class="operator">&&</span> (this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">==</span> <span class="string">"0"</span>))
<span class="keyword">return</span>;
<span class="keyword">if</span> (this.<span class="name">waitingForOperand</span>) {
this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">clear</span>();
this.<span class="name">waitingForOperand</span> <span class="operator">=</span> <span class="number">false</span>;
}
this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">+=</span> <span class="name">digitValue</span>;
}
<span class="name">Calculator</span>.<span class="name">prototype</span>.<span class="name">unaryOperatorClicked</span> <span class="operator">=</span> <span class="keyword">function</span>(<span class="name">op</span>)
{
var <span class="name">operand</span> = this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">-</span> <span class="number">0</span>;
var <span class="name">result</span> = <span class="number">0</span>;
<span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="name">Calculator</span>.<span class="name">SQUARE_OPERATOR</span>) {
<span class="keyword">if</span> (<span class="name">operand</span> <span class="operator"><</span> <span class="number">0</span>) {
this.<span class="name">abortOperation</span>();
<span class="keyword">return</span>;
}
<span class="name">result</span> <span class="operator">=</span> <span class="name">Math</span>.<span class="name">sqrt</span>(<span class="name">operand</span>);
} else <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="name">Calculator</span>.<span class="name">POWER_OPERATOR</span>) {
<span class="name">result</span> <span class="operator">=</span> <span class="name">Math</span>.<span class="name">pow</span>(<span class="name">operand</span>, <span class="number">2</span>);
} else <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="name">Calculator</span>.<span class="name">RECIPROCAL_OPERATOR</span>) {
<span class="keyword">if</span> (<span class="name">operand</span> <span class="operator">==</span> <span class="number">0.0</span>) {
this.<span class="name">abortOperation</span>();
<span class="keyword">return</span>;
}
<span class="name">result</span> <span class="operator">=</span> <span class="number">1</span> <span class="operator">/</span> <span class="name">operand</span>;
}
this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="name">result</span> <span class="operator">+</span> <span class="string">""</span>;
this.<span class="name">waitingForOperand</span> <span class="operator">=</span> <span class="number">true</span>;
}
<span class="name">Calculator</span>.<span class="name">prototype</span>.<span class="name">additiveOperatorClicked</span> <span class="operator">=</span> <span class="keyword">function</span>(<span class="name">op</span>)
{
var <span class="name">operand</span> = this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">-</span> <span class="number">0</span>;
<span class="keyword">if</span> (this.<span class="name">pendingMultiplicativeOperator</span> <span class="operator">!=</span> <span class="name">Calculator</span>.<span class="name">NO_OPERATOR</span>) {
<span class="keyword">if</span> (!this.<span class="name">calculate</span>(<span class="name">operand</span>, this.<span class="name">pendingMultiplicativeOperator</span>)) {
this.<span class="name">abortOperation</span>();
<span class="keyword">return</span>;
}
this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> this.<span class="name">factorSoFar</span> <span class="operator">+</span> <span class="string">""</span>;
<span class="name">operand</span> <span class="operator">=</span> this.<span class="name">factorSoFar</span>;
this.<span class="name">factorSoFar</span> <span class="operator">=</span> <span class="number">0</span>;
this.<span class="name">pendingMultiplicativeOperator</span> <span class="operator">=</span> <span class="name">Calculator</span>.<span class="name">NO_OPERATOR</span>;
}
<span class="keyword">if</span> (this.<span class="name">pendingAdditiveOperator</span> <span class="operator">!=</span> <span class="name">Calculator</span>.<span class="name">NO_OPERATOR</span>) {
<span class="keyword">if</span> (!this.<span class="name">calculate</span>(<span class="name">operand</span>, this.<span class="name">pendingAdditiveOperator</span>)) {
this.<span class="name">abortOperation</span>();
<span class="keyword">return</span>;
}
this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> this.<span class="name">sumSoFar</span> <span class="operator">+</span> <span class="string">""</span>;
} else {
this.<span class="name">sumSoFar</span> <span class="operator">=</span> <span class="name">operand</span>;
}
this.<span class="name">pendingAdditiveOperator</span> <span class="operator">=</span> <span class="name">op</span>;
this.<span class="name">waitingForOperand</span> <span class="operator">=</span> <span class="number">true</span>;
}
<span class="name">Calculator</span>.<span class="name">prototype</span>.<span class="name">multiplicativeOperatorClicked</span> <span class="operator">=</span> <span class="keyword">function</span>(<span class="name">op</span>)
{
var <span class="name">operand</span> = this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">-</span> <span class="number">0</span>;
<span class="keyword">if</span> (this.<span class="name">pendingMultiplicativeOperator</span> <span class="operator">!=</span> <span class="name">Calculator</span>.<span class="name">NO_OPERATOR</span>) {
<span class="keyword">if</span> (!this.<span class="name">calculate</span>(<span class="name">operand</span>, this.<span class="name">pendingMultiplicativeOperator</span>)) {
this.<span class="name">abortOperation</span>();
<span class="keyword">return</span>;
}
this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> this.<span class="name">factorSoFar</span> <span class="operator">+</span> <span class="string">""</span>;
} else {
this.<span class="name">factorSoFar</span> <span class="operator">=</span> <span class="name">operand</span>;
}
this.<span class="name">pendingMultiplicativeOperator</span> <span class="operator">=</span> <span class="name">op</span>;
this.<span class="name">waitingForOperand</span> <span class="operator">=</span> <span class="number">true</span>;
}
<span class="name">Calculator</span>.<span class="name">prototype</span>.<span class="name">equalClicked</span> <span class="operator">=</span> <span class="keyword">function</span>()
{
var <span class="name">operand</span> = this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">-</span> <span class="number">0</span>;
<span class="keyword">if</span> (this.<span class="name">pendingMultiplicativeOperator</span> <span class="operator">!=</span> <span class="name">Calculator</span>.<span class="name">NO_OPERATOR</span>) {
<span class="keyword">if</span> (!this.<span class="name">calculate</span>(<span class="name">operand</span>, this.<span class="name">pendingMultiplicativeOperator</span>)) {
this.<span class="name">abortOperation</span>();
<span class="keyword">return</span>;
}
<span class="name">operand</span> <span class="operator">=</span> this.<span class="name">factorSoFar</span>;
this.<span class="name">factorSoFar</span> <span class="operator">=</span> <span class="number">0.0</span>;
this.<span class="name">pendingMultiplicativeOperator</span> <span class="operator">=</span> <span class="name">Calculator</span>.<span class="name">NO_OPERATOR</span>;
}
<span class="keyword">if</span> (this.<span class="name">pendingAdditiveOperator</span> <span class="operator">!=</span> <span class="name">Calculator</span>.<span class="name">NO_OPERATOR</span>) {
<span class="keyword">if</span> (!this.<span class="name">calculate</span>(<span class="name">operand</span>, this.<span class="name">pendingAdditiveOperator</span>)) {
this.<span class="name">abortOperation</span>();
<span class="keyword">return</span>;
}
this.<span class="name">pendingAdditiveOperator</span> <span class="operator">=</span> <span class="name">Calculator</span>.<span class="name">NO_OPERATOR</span>;
} else {
this.<span class="name">sumSoFar</span> <span class="operator">=</span> <span class="name">operand</span>;
}
this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> this.<span class="name">sumSoFar</span> <span class="operator">+</span> <span class="string">""</span>;
this.<span class="name">sumSoFar</span> <span class="operator">=</span> <span class="number">0.0</span>;
this.<span class="name">waitingForOperand</span> <span class="operator">=</span> <span class="number">true</span>;
}
<span class="name">Calculator</span>.<span class="name">prototype</span>.<span class="name">pointClicked</span> <span class="operator">=</span> <span class="keyword">function</span>()
{
<span class="keyword">if</span> (this.<span class="name">waitingForOperand</span>)
this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="string">"0"</span>;
<span class="keyword">if</span> (this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span>.<span class="name">indexOf</span>(<span class="string">"."</span>) <span class="operator">==</span> -<span class="number">1</span>)
this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">+=</span> <span class="string">"."</span>;
this.<span class="name">waitingForOperand</span> <span class="operator">=</span> <span class="number">false</span>;
}
<span class="name">Calculator</span>.<span class="name">prototype</span>.<span class="name">changeSignClicked</span> <span class="operator">=</span> <span class="keyword">function</span>()
{
var <span class="name">text</span> = this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span>;
var <span class="name">value</span> = <span class="name">text</span> <span class="operator">-</span> <span class="number">0</span>;
<span class="keyword">if</span> (<span class="name">value</span> <span class="operator">></span> <span class="number">0</span>) {
<span class="name">text</span> <span class="operator">=</span> <span class="string">"-"</span> <span class="operator">+</span> <span class="name">text</span>;
} else <span class="keyword">if</span> (<span class="name">value</span> <span class="operator"><</span> <span class="number">0</span>) {
<span class="name">text</span> <span class="operator">=</span> <span class="name">text</span>.<span class="name">slice</span>(<span class="number">1</span>);
}
this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="name">text</span>;
}
<span class="name">Calculator</span>.<span class="name">prototype</span>.<span class="name">backspaceClicked</span> <span class="operator">=</span> <span class="keyword">function</span>()
{
<span class="keyword">if</span> (this.<span class="name">waitingForOperand</span>)
<span class="keyword">return</span>;
var <span class="name">text</span> = this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span>;
<span class="name">text</span> <span class="operator">=</span> <span class="name">text</span>.<span class="name">slice</span>(<span class="number">0</span>, -<span class="number">1</span>);
<span class="keyword">if</span> (<span class="name">text</span>.<span class="name">length</span> <span class="operator">==</span> <span class="number">0</span>) {
<span class="name">text</span> <span class="operator">=</span> <span class="string">"0"</span>;
this.<span class="name">waitingForOperand</span> <span class="operator">=</span> <span class="number">true</span>;
}
this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="name">text</span>;
}
<span class="name">Calculator</span>.<span class="name">prototype</span>.<span class="name">clear</span> <span class="operator">=</span> <span class="keyword">function</span>()
{
<span class="keyword">if</span> (this.<span class="name">waitingForOperand</span>)
<span class="keyword">return</span>;
this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="string">"0"</span>;
this.<span class="name">waitingForOperand</span> <span class="operator">=</span> <span class="number">true</span>;
}
<span class="name">Calculator</span>.<span class="name">prototype</span>.<span class="name">clearAll</span> <span class="operator">=</span> <span class="keyword">function</span>()
{
this.<span class="name">sumSoFar</span> <span class="operator">=</span> <span class="number">0.0</span>;
this.<span class="name">factorSoFar</span> <span class="operator">=</span> <span class="number">0.0</span>;
this.<span class="name">pendingAdditiveOperator</span> <span class="operator">=</span> <span class="name">Calculator</span>.<span class="name">NO_OPERATOR</span>;
this.<span class="name">pendingMultiplicativeOperator</span> <span class="operator">=</span> <span class="name">Calculator</span>.<span class="name">NO_OPERATOR</span>;
this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="string">"0"</span>;
this.<span class="name">waitingForOperand</span> <span class="operator">=</span> <span class="number">true</span>;
}
<span class="name">Calculator</span>.<span class="name">prototype</span>.<span class="name">clearMemory</span> <span class="operator">=</span> <span class="keyword">function</span>()
{
this.<span class="name">sumInMemory</span> <span class="operator">=</span> <span class="number">0.0</span>;
}
<span class="name">Calculator</span>.<span class="name">prototype</span>.<span class="name">readMemory</span> <span class="operator">=</span> <span class="keyword">function</span>()
{
this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> this.<span class="name">sumInMemory</span> <span class="operator">+</span> <span class="string">""</span>;
this.<span class="name">waitingForOperand</span> <span class="operator">=</span> <span class="number">true</span>;
}
<span class="name">Calculator</span>.<span class="name">prototype</span>.<span class="name">setMemory</span> <span class="operator">=</span> <span class="keyword">function</span>()
{
this.<span class="name">equalClicked</span>();
this.<span class="name">sumInMemory</span> <span class="operator">=</span> this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">-</span> <span class="number">0</span>;
}
<span class="name">Calculator</span>.<span class="name">prototype</span>.<span class="name">addToMemory</span> <span class="operator">=</span> <span class="keyword">function</span>()
{
this.<span class="name">equalClicked</span>();
this.<span class="name">sumInMemory</span> <span class="operator">+=</span> this.<span class="name">ui</span>.<span class="name">display</span>.<span class="name">text</span> <span class="operator">-</span> <span class="number">0</span>;
}</pre>
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