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POJavascript 'this' overwriting in Z combinator and every other recursive function
 

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  1. POJavascript 'this' overwriting in Z combinator and every other recursive function
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    <p><strong>Background:</strong></p> <p>I have a recursive function implemented by a <strong>Z-combinator</strong> as is shown <a href="https://stackoverflow.com/questions/17645356/anonymous-recursion-any-way-to-replace-javascript-arguments-callee-to-other">here</a> and <a href="http://am.aurlien.net/post/2810658101/z-combinator" rel="nofollow noreferrer">here</a> so it makes no use of <code>arguments.callee</code> since it will be deprecated in upcoming <strong>ES6</strong>.</p> <p><strong>Issue</strong></p> <p>The main issue with the <strong>Z-combinator</strong> and all recursive anonymous functions I've seen so far is that they updates de <code>this</code> value to the inner function scope (the self-returned at the <code>return</code> clause), so the <code>this</code> that references the top level is lost, and I want to maintain it through all the inner functions.</p> <p>Is there a way to maintain the top level <code>this</code> without passing it as an additional function argument, which is the most obvious way to get rid of this issue but is not as clean as I want?</p> <p><strong>EDIT:</strong></p> <p>Right now I solve the issue by passing the top <code>this</code> reference to the <strong>Z-combinator</strong> like this:</p> <pre><code>Co.Utilities.Z(this.createHTMLFromLOM)(this.LOM, this); </code></pre> <p>in the recursive function I return the same function by passing the top this value like this:</p> <pre><code>function createHTMLFromLOM(callee:any, LOM_section:LOM, self:any):void { /* Some other code. */ return callee(LOM_section.children[widget], self); } </code></pre> <p>This is my <strong>Z-combinator</strong> definition:</p> <pre><code>function Z(func:any):any { var f = function () { return func.apply(null, [f].concat([].slice.apply(arguments))); }; return f; } </code></pre> <p>Thanks</p>
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