Polyfills

PublishedSeptember 29, 2022

Creative Full Stack Web Developer with 3+ years of experience. Love open source and learning new things every day. Quick learner and believes in hard work

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Array.prototype.filter = function (callbackFn) { let outputArr = []; this.forEach((el, index) => { if (callbackFn(el, index, this)) { outputArr.push(el); } }); return outputArr; }; console.log([1, 2, 4, 5, 6, 7].filter((el) => el % 2 == 0));

Array.prototype.map = function (callbackFn) { let outputArr = []; this.forEach((element, index) => { outputArr.push(callbackFn(element, index, this)); }); return outputArr; }; console.log([1, 2, 3, 4].map((e) => 10 * e));

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