javascript tutorial - [Solved-5 Solutions] Empty an array - javascript - java script - javascript array
Problem:
Is there a way to empty an array and if so possibly with .remove()?
Solution 1:
If we need to keep the original array because we have other references to it that should be updated too, we can clear it without creating a new array by setting its length to zero:
A.length = 0;
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Solution 2:
A more cross-browser friendly and more optimal solution will be to use the splice method to empty the content of the array A as below:
A.splice(0, A.length);
Solution 3:
Performance test:
a = []; // 37% slower
a.length = 0; // 89% slower
a.splice(0, a.length) // 97% slower
while (a.length > 0) {
a.pop();
} // Fastestclick below button to copy the code. By JavaScript tutorial team
Solution 4:
We can add this to your JavaScript file to allow your arrays to be "cleared":
Array.prototype.clear = function() {
this.splice(0, this.length);
};
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Then we can use it like this:
var list = [1, 2, 3];
list.clear();
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Or if we want to be sure we don't destroy something:
if (!Array.prototype.clear) {
Array.prototype.clear = function() {
this.splice(0, this.length);
};
}
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Solution 5:
Array.prototype.clear = function() {
this.length = 0;
};