Assign value from one array as a key to another array using lodash javascript

Question

I have 2 arrays -

1- Numbers = [3,4,5]
2- selection= [ [1,2,3,4],[6,5,4,3],[2,9,4]]

Now in output I want 3 should be key i.e index of [1,2,3,4] and so on

Output should be below -

  selection= = { '3':[1,2,3,4] ,'4':[6,5,4,3] ,'5':[2,9,4]}

Iterate, get elements at current index from both arrays, add into object. Why you need lodash for that? — Tushar, Nov 23 '16 at 13:44

stasovlas · Accepted Answer · 2016-11-23T13:58:34.503

4

just use _.zipObject https://lodash.com/docs/4.17.2#zipObject

_.zipObject(Numbers, selection)

edited Nov 23 '16 at 13:58

answered Nov 23 '16 at 13:50

stasovlas

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This answer should clarify that it is using lodash. The only hint is the tag in the question, which is definitely not enough. Likewise, posting just a code snippet cannot possibly qualify as an "answer", even if it is technically correct. – Stephan Bijzitter Nov 23 '16 at 13:54
2

Despite.. He got the most upvote here, because he is right and because he read the question AND the tag. The answer can be found in lodash documentation, there is nothing to add I think. – Aks Nov 23 '16 at 13:56

Nina Scholz · Answer 2 · 2016-11-23T13:54:31.650

in plain Javascript, you could iterate numbers and build a new object with a number as key and take as value the item of selection with the same index.

var numbers = [3, 4, 5],
    selection = [[1, 2, 3, 4], [6, 5, 4, 3], [2, 9, 4]],
    result = {};

numbers.forEach(function (k, i) {
    result[k] = selection[i];
});

console.log(result);

ES6

var numbers = [3, 4, 5],
    selection = [[1, 2, 3, 4], [6, 5, 4, 3], [2, 9, 4]],
    result = numbers.reduce((r, k, i) => Object.assign(r, { [k]: selection[i] }), {});

console.log(result);

Assign value from one array as a key to another array using lodash javascript

2 Answers2