JavaScript Array method: concat()
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The concat() method (when applied to a JavaScript
array) joins
arrays and returns a copy of the joined array.
It
has the following syntax with the following parameters. It returns an
array.
array.concat(array1, array2, …)
|
Parameter
|
Required / Optional
|
Description
|
|
array1, array2, …
|
Required
|
The arrays to be joined
(inserted after the original array in the returned result)
|
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 = ["a","b"];
document.getElementById("Example").innerHTML =
'var h = ["a","b"];' + '<br>' +
'var x = h.concat(["c","d"],"e");';
document.getElementById("Result").innerHTML
= h.concat(["c","d"],"e");
</script>
</body>
</html>
|
FUNCTION THAT MAY ASSIST IN TESTING WHETHER FEATURE IS SUPPORTED:
function isSupportedJavaScriptMethodArrayConcat() {
var h = [1, 2, 3]; return !!h.concat;
} |
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