Run results for: concat vs spread operator vs push (object reference)

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:75.0) Gecko/20100101 Firefox/75.0

Browser: Firefox 75

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
concat	278.2 Ops/sec
Spread operator	102.3 Ops/sec
push	104717.3 Ops/sec

Script Preparation code:

class X { uuid = "0123456789ABCDEF" }

var array1 = []
for (let i = 0; i < 100; i++) {
  array1.push(new X())
}

var array2 = []
for (let i = 0; i < 100; i++) {
  array2.push(new X())
}

Tests:

concat
array1 = array1.concat(array2)
Spread operator
array1 = [...array1, ...array2]
push
array1.push(...array2)

Run results for: concat vs spread operator vs push (object reference)

concat vs spread operator vs push (object reference) with array of 100 elements.

concat

Spread operator

push