JavaScript: void operator
Description
The void operator is used to evaluate a JavaScript expression without returning a value.
Syntax
void (expression) void expression
Example -1:
The following web document shows how the void operator is used.
HTML Code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset=utf-8>
<title>JavaScript void operator example</title>
</head>
<body>
<a href="javascript:void(alert('Thank you.'))">Click here to see a message</a>
</body>
</html>
View the example in the browser
Example -2:
In the following web document, void operator is used to call a function.
HTML Code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset=utf-8>
<title>JavaScript void operator (calling function) example</title>
</head>
<body>
<script type="text/javascript">
</script>
<a href="javascript:void(testfunc())">
Click here to call testfunc()</a>
</body>
</html>
View JavaScript void operator ( call a function) example in the browser
See also
Conditional Operator
comma
delete
function
in
instanceof
new
this
typeof
Previous: JavaScript: typeof operator
Next: JavaScript: Block statement
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JavaScript: Tips of the Day
How to insert an item into an array at a specific index (JavaScript)?
What you want is the splice function on the native array object.
arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:
var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());
Ref: https://bit.ly/2BXbp04
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