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Added ugly ES5 equivalent of findIndex #111

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Added ugly ES5 equivalent of findIndex #111

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2 changes: 1 addition & 1 deletion features.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -1404,7 +1404,7 @@ New function for finding an element in an array.
6| [ 1, 3, 4, 2 ].|findIndex|(|x =>| x > 3); // 2

5| [ 1, 3, 4, 2 ].|filter|(|function (x) { return| x > 3; })|[0]|; // 4
5| // no equivalent in ES5
5| [ 1, 3, 4, 2 ].|map|(|function(x, index) { return| x > 3 |? index : undefined; }).filter(function (x) { return x !== undefined; }|)|[0]|; // 2

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4 changes: 2 additions & 2 deletions index.html
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Expand Up @@ -1918,8 +1918,8 @@
</div>
<div class="arrow"><i class="fa fa-caret-up"></i><i class="fa fa-caret-down"></i></div><div class="js es5">
<div class="title"><b>ECMAScript 5</b> &mdash; syntactic sugar: <span class="style reduced">reduced</span> | <span class="style traditional">traditional</span></div>
<div class="code"><span class="punctuation">[</span> <span class="literal">1</span><span class="punctuation">,</span> <span class="literal">3</span><span class="punctuation">,</span> <span class="literal">4</span><span class="punctuation">,</span> <span class="literal">2</span> <span class="punctuation">]</span><span class="punctuation">.</span><span class="mark">filter</span><span class="punctuation">(</span><span class="mark"><span class="keyword">function</span> <span class="punctuation">(</span>x<span class="punctuation">)</span> <span class="punctuation">{</span> <span class="keyword">return</span></span> x <span class="punctuation">&gt;</span> <span class="literal">3</span><span class="semi">;</span> <span class="punctuation">}</span><span class="punctuation">)</span><span class="mark"><span class="punctuation">[</span><span class="literal">0</span><span class="punctuation">]</span></span><span class="semi">;</span><span class="comment"> // <span class="literal">4</span></span><span class="comment">
// no equivalent <span class="keyword">in</span> ES<span class="literal">5</span></span></div>
<div class="code"><span class="punctuation">[</span> <span class="literal">1</span><span class="punctuation">,</span> <span class="literal">3</span><span class="punctuation">,</span> <span class="literal">4</span><span class="punctuation">,</span> <span class="literal">2</span> <span class="punctuation">]</span><span class="punctuation">.</span><span class="mark">filter</span><span class="punctuation">(</span><span class="mark"><span class="keyword">function</span> <span class="punctuation">(</span>x<span class="punctuation">)</span> <span class="punctuation">{</span> <span class="keyword">return</span></span> x <span class="punctuation">&gt;</span> <span class="literal">3</span><span class="semi">;</span> <span class="punctuation">}</span><span class="punctuation">)</span><span class="mark"><span class="punctuation">[</span><span class="literal">0</span><span class="punctuation">]</span></span><span class="semi">;</span><span class="comment"> // <span class="literal">4</span></span>
<span class="punctuation">[</span> <span class="literal">1</span><span class="punctuation">,</span> <span class="literal">3</span><span class="punctuation">,</span> <span class="literal">4</span><span class="punctuation">,</span> <span class="literal">2</span> <span class="punctuation">]</span><span class="punctuation">.</span><span class="mark">map</span><span class="punctuation">(</span><span class="mark"><span class="keyword">function</span><span class="punctuation">(</span>x<span class="punctuation">,</span> index<span class="punctuation">)</span> <span class="punctuation">{</span> <span class="keyword">return</span></span> x <span class="punctuation">&gt;</span> <span class="literal">3</span> <span class="mark">? index : undefined<span class="semi">;</span> <span class="punctuation">}</span><span class="punctuation">)</span><span class="punctuation">.</span>filter<span class="punctuation">(</span><span class="keyword">function</span> <span class="punctuation">(</span>x<span class="punctuation">)</span> <span class="punctuation">{</span> <span class="keyword">return</span> x !== undefined<span class="semi">;</span> <span class="punctuation">}</span></span><span class="punctuation">)</span><span class="mark"><span class="punctuation">[</span><span class="literal">0</span><span class="punctuation">]</span></span><span class="semi">;</span><span class="comment"> // <span class="literal">2</span></span></div>
<i class="icon fa fa-circle"></i>
<i class="icon fa fa-times-circle"></i>
</div>
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