JavaScript Array method: shift()
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The shift() method (when applied to a JavaScript
array) removes
the first element of the array and returns that element.
It
has the following syntax with no parameters. It returns the relevant object
or primitive that was at the relevant place in the original array.
array.shift()
EXAMPLE:
HTML USED IN THIS EXAMPLE:
<!DOCTYPE html>
<html> <!-- Copyright (c) Nematrian Limited 2018 -->
<head>
<style>
table,th,tr,td {border: 1px solid black; border-collapse: collapse;}
</style>
</head>
<body>
<table>
<tr>
<th>Example</th>
<th>Resulting value of <code>x</code></th>
</tr>
<tr>
<td><code id="Example"></code></td>
<td><code id="Result"></code></td>
</tr>
</table>
<script>
var h = [-1, 2, 3];
var y = h.shift();
document.getElementById("Example").innerHTML =
'var h = [-1, 2, 3];<br>' +
'var y = h.pop();<br>' +
'var x = y + "|" + h;';
document.getElementById("Result").innerHTML = y + "|" + h;
</script>
</body>
</html>
|
FUNCTION THAT MAY ASSIST IN TESTING WHETHER FEATURE IS SUPPORTED:
function isSupportedJavaScriptMethodArrayShift() {
var h = [1, 2, 3]; return !!h.shift;
} |
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