Programmed mapper

[maoyang]

Kata 來源 https://www.codewars.com/kata/programmed-mapper

Description:

Write a function mapEmUp that conditionally maps an array of inputs according to a set of supplied conditions. The function takes in two arguments:

An array of inputs
An array of key-value pairs of predicates and mappers
For example:

mapEmUp([1, 2, 3], [
                    [ function (i) { return i>2; },
                    function (i) { return i; }],
                    [ function (i) { return i<2; },
                    function () { return 0; }]
                  ]);

returns

[0, -1, 3]

Each item in the second argument array is an array itself, where the first element is a predicate and the second element is a mapper. The function mapEmUp should pick up each item from the supplied array and run it against each item in the second argument. Where a predicate turns out to be true, the corresponding mapper is applied. Note that the search only continues until a match is found. When there is no predicate matching a specific input, return -1;

說明

mapEmUp是一個function, 第一個參數是一個陣列為input的值, 第二個parameter是一個key-value所組成的陣列(predicate, mapper)用來測試輸入的值, 當predicate function條件符合就會由mapper function傳回值
例如這個題目的輸入 [1,2,3] , 就將值傳入測試, 結果傳回 [0,-1,3]

[vampireneo]

Pass