Run results for: JS array test

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Splice	5069670.5 Ops/sec
Assign array	7312821.5 Ops/sec

Script Preparation code:

var input = [];
var new_array = [];
for (var i = 0; i < 500; i++) {
    input.push({
        id: i,
        data: Math.random()
            .toString(36)
            .replace(/[^a-z]+/g, "")
            .substr(0, 10),
        title: Math.random()
            .toString(36)
            .replace(/[^a-z]+/g, "")
            .substr(0, 10),
        is_active: Math.random() > 0.5 ? true : false,
    });
  
 new_array.push({
        id: i,
        data: Math.random()
            .toString(36)
            .replace(/[^a-z]+/g, "")
            .substr(0, 10),
        title: Math.random()
            .toString(36)
            .replace(/[^a-z]+/g, "")
            .substr(0, 10),
        is_active: Math.random() > 0.5 ? true : false,
    }); 
}

Tests:

Splice
input.splice(0, input.length, new_array);
Assign array
input = new_array

Run results for: JS array test

Test splice vs assign

Splice

Assign array