Run results for: Branching if-else-if, if-return, lodash cond v2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36

Browser: Chrome 87

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
initial	354773.1 Ops/sec
plain	329599.4 Ops/sec
lodash	152107.1 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var TYPES = {
  A: 'a',
  B: 'b',
  C: 'c',
  CExt: 'c_ext',
  D: 'd',
  E: 'e',
  F: 'f',
  G: 'g',
  Other: 'Other',
};

function isA(x) {
  return x.type === 'a';
}

function isB(x) {
  return x.type === 'b';
}

function isC(x) {
  return x.type === 'c';
}

function isExt(x) {
  return x.type.indexOf('_ext') >= 0;
}

function isD(x) {
  return x.type === 'd';
}

function isE(x) {
  return x.type === 'e';
}

function isF(x) {
  return x.type === 'f';
}

function isG(x) {
  return x.type === 'g';
}

var testData = [{ type: 'a'}, { type: 'c'}, { type: 'c_ext'}, { type: 'z'}, { type: 'f'}];

Tests:

initial
function getType(x) { if (isA(x)) { return TYPES.A; } else if (isB(x)) { return TYPES.B; } else if(isC(x)) { if (isExt(x)) { return TYPES.CExt; } return TYPES.C; } else if(isD(x)) { return TYPES.D; } else if(isE(x)){ return TYPES.E; } else if(isF(x)) { return TYPES.F; } else if(isG(x)) { return TYPES.G; } return TYPES.Other; } testData.map(getType);
plain
function getTypePlain(x) { if (isA(x)) { return TYPES.A; } if (isB(x)) { return TYPES.B; } if(isC(x)) { if (isExt(x)) { return TYPES.CExt; } return TYPES.C; } if(isD(x)) { return TYPES.D; } if(isE(x)){ return TYPES.E; } if(isF(x)) { return TYPES.F; } if(isG(x)) { return TYPES.G; } return TYPES.Other; } testData.map(getTypePlain);
lodash
var _getType = _.cond([ [isA, _.constant(TYPES.A)], [isB, _.constant(TYPES.B)], [isC, _.cond([ [isExt, _.constant(TYPES.Ext)], [_.stubTrue, _.constant(TYPES.C)] ])], [isD, _.constant(TYPES.D)], [isE, _.constant(TYPES.E)], [isF, _.constant(TYPES.F)], [isG, _.constant(TYPES.G)], [_.stubTrue, _.constant(TYPES.Other)], ]); testData.map(_getType);

Run results for: Branching if-else-if, if-return, lodash cond v2

initial

plain

lodash