Benchmark: Empty an array in JavaScript (with baseline) - MeasureThat.net

Empty an array in JavaScript (with baseline) (version: 0)

Given an array of 100,000 random numbers, is it faster to empty the array by instantiating a new array, setting its length to zero, splicing it at index zero, or popping all values?

Comparing performance of: Instantiate new array vs Set length to zero vs Splice at index zero vs Pop all values vs JSON.parse baseline

Created: 2 years ago by: Guest

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Script Preparation code:

var size = 100000;
var a = [];
for (var i = 0; i < size; i++){
  a.push(Math.random());
}
var json = JSON.stringify(a);

Tests:

Instantiate new array
var a1 = JSON.parse(json); a1 = [];
Set length to zero
var a2 = JSON.parse(json); a2.length = 0;
Splice at index zero
var a3 = JSON.parse(json); a3.splice(0, a3.length);
Pop all values
var a4 = JSON.parse(json); while(a4.length > 0){ a4.pop(); }
JSON.parse baseline
var a0 = JSON.parse(json);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Instantiate new array
Set length to zero
Splice at index zero
Pop all values
JSON.parse baseline

Fastest: N/A

Slowest: N/A

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