Created
October 21, 2020 23:36
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Own version of map, reduce and filter (ES6)
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| // map | |
| const map = (arr, func) => { | |
| const outputArr = []; | |
| for (let i = 0; i<arr.length; i++ ){ | |
| outputArr.push(func(arr[i])); | |
| } | |
| return outputArr; | |
| } | |
| const multiply2 = num => num*2; | |
| const multiply3 = num => num*3; | |
| const square = num => num*num; | |
| const answer1 = map([1,2,3],multiply2); | |
| const answer2 = map([1,2,3],multiply3); | |
| const answer3 = map([1,2,3],square); | |
| console.log(answer1,answer2, answer3); | |
| // reduce function | |
| const reducer = (arr, callB, initial) => { | |
| for (let i = 0; i<arr.length; i++ ){ | |
| initial = callB(arr[i], initial); | |
| } | |
| return initial; | |
| } | |
| const add = (val,val2) => val+val2; | |
| const answer = reducer([2,3,4], add,0); | |
| console.log(answer); | |
| // filter | |
| const filter = (arr , condition) => { | |
| const newArr = []; | |
| for(let i = 0; i < arr.length; i ++){ | |
| if(condition(arr[i])) newArr.push(arr[i]); | |
| } | |
| return newArr; | |
| } | |
| const isEven = num => (num%2 === 0) ? true : false; | |
| const isOdd = num => (isEven(num)) ? false : true; | |
| console.log(filter([0,2,4,6,8,9],isEven)); | |
| console.log(filter([0,2,4,6,8,9],isOdd)); | |
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