Run results for: string concat big string

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser: Chrome 122

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Join	373.3 Ops/sec
Array reduce (how is this so fast?)	2049614.9 Ops/sec
Template literals	378.8 Ops/sec

Script Preparation code:

function generateRandomString(length) {
    var result           = '';
    var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    var charactersLength = characters.length;
    for ( var i = 0; i < length; i++ ) {
       result += characters.charAt(Math.floor(Math.random() * charactersLength));
    }
    return result;
}


var arr = " ".repeat(100).split(" ").map(x => generateRandomString(3000));

Tests:

Join
arr.join(", ");
Array reduce (how is this so fast?)
arr.reduce( (s, el) => s+el )
Template literals
`${[...arr]}`

Run results for: string concat big string

Join

Array reduce (how is this so fast?)

Template literals