Run results for: js custom yield vs base ma

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36

Browser: Chrome 94

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
yield	6.2 Ops/sec
base	6.4 Ops/sec

Tests:

yield
const arr = []; for (let i = 0; i < 100000; i++) { const obj = {}; for (let j = 0; j < 10; j++) { obj[`prop_${j}`] = j; } arr.push(obj); } const where = function*(isMatch) { for (let item of this) { if (isMatch(item)) { yield item; } } }; const select = function*(fn) { for (let item of this) { yield fn(item); } }; const toArray = function() { return Array.from(this); }; const Generator = Object.getPrototypeOf(function*() {}); Generator.prototype.where = where; Array.prototype.where = where; Generator.prototype.select = select; Array.prototype.select = select; Generator.prototype.toArray = toArray; Array.prototype.toArray = toArray; arr.select((obj) => obj.prop_3) .where((num) => num > 5) .toArray();
base
const arr = []; for (let i = 0; i < 100000; i++) { const obj = {}; for (let j = 0; j < 10; j++) { obj[`prop_${j}`] = j; } arr.push(obj); } const where = function*(isMatch) { for (let item of this) { if (isMatch(item)) { yield item; } } }; const select = function*(fn) { for (let item of this) { yield fn(item); } }; const toArray = function() { return Array.from(this); }; const Generator = Object.getPrototypeOf(function*() {}); Generator.prototype.where = where; Array.prototype.where = where; Generator.prototype.select = select; Array.prototype.select = select; Generator.prototype.toArray = toArray; Array.prototype.toArray = toArray; arr.map((obj) => obj.prop_3).filter((num) => num > 5);