If you are going to use filter, it'd be better to make the filter method pure.
filter
[1,2,1,2,35,3,4].filter((v, i, arr) => arr.indexOf(v) === i)
That way, you can extract the function out:
function makeUniq(v, i, arr) { return arr.indexOf(v) === i; } [1,2,3,4,4,3,4].filter(makeUniq); [6,7,3,4,6,7,7].filter(makeUniq);
Also, map is supposed to be pure, use forEach to do mutations instead.
map
forEach
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If you are going to use
filter, it'd be better to make the filter method pure.That way, you can extract the function out:
Also,
mapis supposed to be pure, useforEachto do mutations instead.