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  1. PO
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    <p>Others have already explained what this code does. It creates an object (called <code>this.String</code>) that contains a single function (called <code>Get</code>). I'd like to explain when you could use this function.</p> <p>This function can be useful in cases where you need a higher order function (that is a function that expects another function as its argument).</p> <p>Say you have a function that does something to each element of an <code>Array</code>, lets call it <code>map</code>. You could use this function like so:</p> <pre><code>function inc (x) { return x + 1; } var arr = [1, 2, 3]; var newArr = arr.map(inc); </code></pre> <p>What the <code>map</code> function will do, is create a new array containing the values <code>[2, 3, 4]</code>. It will do this by calling the function <code>inc</code> with each element of the array.</p> <p>Now, if you use this method a lot, you might continuously be calling <code>map</code> with all sorts of arguments:</p> <pre><code>arr.map(inc); // to increase each element arr.map(even); // to create a list of booleans (even or odd) arr.map(toString); // to create a list of strings </code></pre> <p>If for some reason you'd want to replace the entire array with the same string (but keeping the array of the same size), you could call it like so:</p> <pre><code>arr.map(this.String.Get("my String")); </code></pre> <p>This will create a new array of the same size as <code>arr</code>, but just containing the string <code>"my String"</code> over and over again.</p> <p>Note that in some languages, this function is predefined and called <code>const</code> or <code>constant</code> (since it will always return the same value, each time you call it, no matter what its arguments are).</p> <hr> <p>Now, if you think that this example isn't very useful, I would agree with you. But there are cases, when programming with higher order functions, when this technique is used.</p> <p>For example, it can be useful if you have a tree you want to 'clear' of its values but keep the structure of the tree. You could do <code>tree.map(this.String.Get("default value"))</code> and get a whole new tree is created that has the exact same shape as the original, but none of its values.</p>
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    1. CO+1. Good example of why we'd want one of these.
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      1. USAnthonyWJones
 

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