Using Array length property can set or check array length 0 in JavaScript. This property returns the number of elements in the array. If the number is greater than 0, it evaluates to true.
Check Array length 0 or Not
Simple checking Array length.
<!DOCTYPE HTML>
<html>
<body>
<script>
var arr1 = [1, 2, 3, 5, 2, 8, 9, 2];
var arr2 = []
console.log(arr1.length);
console.log(arr2.length);
</script>
</body>
</html> Output:
Checking zero with if-else condition
<script>
var arr2 = []
if (arr2.length)
output = true;
else
output = false;
console.log(output);
</script> Output: false
Set JavaScript Array length 0
The way to empty an array is to set its length to zero.
<!DOCTYPE HTML>
<html>
<body>
<script>
var arr1 = [1, 2, 3, 5, 2, 8, 9, 2];
arr1.length = 0;
console.log(arr1);
</script>
</body>
</html> Output:
Do comment if you have any doubts and suggestions on this JS Array topic.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version