JavaScript String method: startsWith()
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The startsWith() method (when applied to a
JavaScript
string) returns
true if the string starts with a specified string, otherwise returns false.
It
has the following syntax with the following parameters:
string.startsWith(searchvalue,startposition)
|
Parameter
|
Required / Optional
|
Description
|
|
searchvalue
|
Required
|
Value to be searched
for
|
|
startposition
|
Optional
|
(default is 0).
Position in underlying string from which to search from
|
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 y = "abcde";
var y2 = "cd";
document.getElementById("Example").innerHTML =
'var y = "' + y + '";<br>' +
'var x = y.startsWith("' + y2 + '",2);';
document.getElementById("Result").innerHTML =
y.startsWith(y2,2);
</script>
</body>
</html>
|
FUNCTION THAT MAY ASSIST IN TESTING WHETHER FEATURE IS SUPPORTED:
function isSupportedJavaScriptMethodStringStartsWith() {
var z = "abc"; return !!z.startsWith;
} |
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