Run results for: Switch vs Prepared Object Literal vs Prepared Array

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.1.2 Safari/605.1.15

Browser: Safari 14

Operating system: Mac OS X 10.14.6

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Switch	350225.9 Ops/sec
Object Literal	347758.9 Ops/sec
Array Literal	349961.7 Ops/sec

Script Preparation code:

var objLiteral = {
  0: function() {
    console.log('A');
  },
  1: function() {
    console.log('B');
  },
  2: function() {
    console.log('C');
  }
}

var arrayLiteral = [
  function() {
    console.log('A');
  },
  function() {
    console.log('B');
  },
  function() {
    console.log('C');
  }
];

function usingSwitch(c) {
  switch (c) {
    case 0: console.log('A'); break;
    case 1: console.log('B'); break;
    case 2: console.log('C'); break;
  }
}

Tests:

Switch
usingSwitch(Math.floor(Math.random() * 3))
Object Literal
objLiteral[Math.floor(Math.random() * 3)]();
Array Literal
arrayLiteral[Math.floor(Math.random() * 3)]();

Run results for: Switch vs Prepared Object Literal vs Prepared Array

Switch

Object Literal

Array Literal