Run results for: helpers.merge vs object.assign vs underscore.extend

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Browser: Chrome 69

Operating system: Mac OS X 10.13.6

Device Platform: Desktop

Date tested: 5 years ago

HTML Preparation code:

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

Tests:

helpers.merge
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var merge = function (a, b, options) { if (options == null) { options = {}; } if (!a) { return b; } if (!b) { return a; } var deep = options.deep || false; var sum = options.sum || false; var r ={}; for(var i in a ){ r[i] = a[i]; } for(var j in b ){ if (deep && r.hasOwnProperty(j) && this.isObject(r[j]) && this.isObject(b[j])) { r[j] = this.merge(r[j], b[j], options); } else { if( sum === true ) { if( ( jpath.isNumber( r[ j ] ) === true ) && ( jpath.isNumber( b[ j ] ) === true ) ) { r[j] += b[j]; } else { r[j] = b[j]; } } else { r[j] = b[j]; } } } return r; }; var c = merge(a, b);
object.assign
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = Object.assign(a, b);
underscore.extend
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var createAssigner = function(keysFunc, undefinedOnly) { return function(obj) { var length = arguments.length; if (length < 2 || obj == null) return obj; for (var index = 1; index < length; index++) { var source = arguments[index], keys = keysFunc(source), l = keys.length; for (var i = 0; i < l; i++) { var key = keys[i]; if (!undefinedOnly || obj[key] === void 0) obj[key] = source[key]; } } return obj; }; }; var allKeys = function(obj) { if (!_.isObject(obj)) return []; var keys = []; for (var key in obj) keys.push(key); return keys; }; var extend = createAssigner(allKeys); var c = extend(a, b);