JavaScript Operator: equal
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In JavaScript,
the == operator
is the ‘equal to’ operator:
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x
|
y
|
x == y
|
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8
|
8
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true
|
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8
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5
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false
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Note: if x and y
are of different type then some type coercion
will typically occur, and values that developers might not immediately
recognise as ‘equal’ may be deemed equal by this operator. If you want only
variables that are of the same type to pass the equality test then you should
use the strictly equal to operator, i.e. ===.
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; text-align: center;}</style>
</head>
<body>
<table>
<tr>
<th> x </th><th> y </th>
<th><code>x == y</code></th>
</tr>
<tr>
<td><code>8</code></td><td><code>5</code></td>
<td><code id="A"></code></td>
</tr>
<tr>
<td><code>8</code></td><td><code>8</code></td>
<td><code id="B"></code></td>
</tr>
<tr>
</table>
<script>
document.getElementById("A").innerHTML = 8 == 5;
document.getElementById("B").innerHTML = 8 == 8;
</script>
</body>
</html>
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