JavaScript Number method: isSafeInteger()
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The isSafeInteger() method (of the JavaScript
Number
object) returns true if value is of type Number and is a safe integer,
otherwise false. A safe integer is one that can be exactly represented as an
IEEE-754 double precision number, i.e. is an integer in the range -(253
- 1) to (253 - 1).
It
has the following syntax with the following parameters:
Number.isSafeInteger(x)
|
Parameter
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Required / Optional
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Description
|
|
x
|
Required
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Input parameter
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EXAMPLE: [This feature does not appear to be supported by your browser]
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>
document.getElementById("Example").innerHTML =
'var x = Number.isSafeInteger(1e160-1);';
document.getElementById("Result").innerHTML =
Number.isSafeInteger(1e160-1);
</script>
</body>
</html>
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FUNCTION THAT MAY ASSIST IN TESTING WHETHER FEATURE IS SUPPORTED:
function isSupportedJavaScriptMethodNumberIsSafeInteger() {
var z = 12.5; return !!z.isSafeInteger;
} |
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