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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>JS Array Some & Every</title>
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<body>
<h1>JS Array Some & Every</h1>
<h1>Array some()</h1>
<p>
The Javascript <strong>arr.some() </strong>method checks whether
at least one of the elements of the array satisfies the condition checked
by the argument method.
</p>
<h3>Syntax</h3>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript">arr<span class="token punctuation">.</span><span class="token function">some</span><span class="token punctuation">(</span><span class="token function">callback</span><span class="token punctuation">(</span>element<span class="token punctuation">,</span>index<span class="token punctuation">,</span>array<span class="token punctuation">)</span><span class="token punctuation">,</span>thisArg<span class="token punctuation">)</span></code></pre>
<p>
<strong>Parameters: </strong>This method accepts five parameters as
mentioned above and described below:
</p>
<ul>
<li>
<strong>callback: </strong>This parameter holds the function to be
called for each element of the array.
<ul>
<li>
<strong>element:</strong> The parameter holds the value of the
elements being processed currently.
</li>
<li>
<strong>index:</strong> This parameter is optional, it holds
the index of the currentValue element in the array starting from 0.
</li>
<li>
<strong>array:</strong> This parameter is optional, it holds
the complete array on which Array.every is called.
</li>
</ul>
</li>
<li>
<strong>thisArg:</strong> This parameter is optional, it holds the
context to be passed as this is to be used while executing the callback
function. If the context is passed, it will be used like this for each
invocation of the callback function, otherwise undefined is used as
default.
</li>
</ul>
<p>
<strong>Return value: </strong>This method returns true even if one
of the elements of the array satisfies the condition(and does not check
the remaining values) implemented by the argument method. If no element of
the array satisfies the condition then it returns false.<br />
</p>
<pre
class="language-markup"
tabindex="0"
><code class="language-markup"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>JavaScript<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span><span class="token punctuation">></span></span><span class="token script"><span class="token language-javascript">
<span class="token keyword">var</span> ages <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">13</span><span class="token punctuation">,</span> <span class="token number">18</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>ages <span class="token operator">+</span> <span class="token string">"<br>"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> b <span class="token operator">=</span> ages<span class="token punctuation">.</span><span class="token function">some</span><span class="token punctuation">(</span>checkAdult<span class="token punctuation">)</span><span class="token punctuation">;</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>b <span class="token operator">+</span> <span class="token string">"<br>"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span>
</code></pre>
<hr />
<h3>Array every()</h3>
<p>
The Javascript <strong>Array.every()</strong> method considers
all the elements of an array and then further checks whether all the
elements of the array satisfy the given condition (passed by in user) or
not that is provided by a method passed to it as the argument.
</p>
<h3>Syntax:</h3>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript"><span class="token comment">// Arrow function</span>
<span class="token function">every</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">element</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span> <span class="token comment">/* … */</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token function">every</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">element<span class="token punctuation">,</span> index</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span> <span class="token comment">/* … */</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token function">every</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">element<span class="token punctuation">,</span> index<span class="token punctuation">,</span> array</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span> <span class="token comment">/* … */</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token comment">// Callback function</span>
<span class="token function">every</span><span class="token punctuation">(</span>callbackFn<span class="token punctuation">)</span>
<span class="token function">every</span><span class="token punctuation">(</span>callbackFn<span class="token punctuation">,</span> thisArg<span class="token punctuation">)</span>
<span class="token comment">// Inline callback function</span>
<span class="token function">every</span><span class="token punctuation">(</span><span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">element</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">/* … */</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token function">every</span><span class="token punctuation">(</span><span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">element<span class="token punctuation">,</span> index</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">/* … */</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token function">every</span><span class="token punctuation">(</span><span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">element<span class="token punctuation">,</span> index<span class="token punctuation">,</span> array</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">/* … */</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token function">every</span><span class="token punctuation">(</span><span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">element<span class="token punctuation">,</span> index<span class="token punctuation">,</span> array</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">/* … */</span> <span class="token punctuation">}</span><span class="token punctuation">,</span> thisArg<span class="token punctuation">)</span></code></pre>
<p>
<strong>Parameters:</strong> This method accepts five parameters as
mentioned above and described below:
</p>
<ul>
<li>
<strong>callback:</strong> This parameter holds the function to be
called for each element of the array.
</li>
<li>
<strong>element: </strong>The parameter holds the value of the
elements being processed currently.
</li>
<li>
<strong>index:</strong> This parameter is optional, it holds the
index of the current value element in the array starting from 0.
</li>
<li>
<strong>array: </strong>This parameter is optional, it holds the
complete array on which Array.every is called.
</li>
<li>
<strong>thisArg:</strong> This parameter is optional, it holds the
context to be passed as this is to be used while executing the callback
function. If the context is passed, it will be used like this for each
invocation of the callback function, otherwise undefined is used as
default.
</li>
</ul>
<p>
<strong>Return value: </strong>This method returns a Boolean value
true if all the elements of the array follow the condition implemented by
the argument method. If any one of the elements of the array does not
satisfy the argument method, then this method returns false.<br />
</p>
<pre
class="language-markup"
tabindex="0"
><code class="language-markup"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>JavaScript<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span><span class="token punctuation">></span></span><span class="token script"><span class="token language-javascript">
<span class="token keyword">var</span> ages <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">19</span><span class="token punctuation">,</span> <span class="token number">18</span><span class="token punctuation">,</span> <span class="token number">20</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>ages <span class="token operator">+</span> <span class="token string">"<br>"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> b <span class="token operator">=</span> ages<span class="token punctuation">.</span><span class="token function">every</span><span class="token punctuation">(</span>checkAdult<span class="token punctuation">)</span><span class="token punctuation">;</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>b <span class="token operator">+</span> <span class="token string">"<br>"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span>
</code></pre>
<hr />
</body>
<script>
// let ary = [26, 15];
// let b = ary.some(checkAdult);
// document.write(b);
// function checkAdult(ages) {
// return ages >= 18;
// }
let ary = [26, 55];
let b = ary.every(checkAdult);
document.write(b);
function checkAdult(ages) {
return ages >= 18;
}
</script>
</html>