30-seconds-of-code/nthArg.md at bac4e5d9c174ed82a16f2bb4b5d848679e5ebb56

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Angelos Chalaris bac4e5d9c1 Add nthArgument

2018-01-23 21:27:37 +02:00

Creates a function that gets the argument at index n. If n is negative, the nth argument from the end is returned.

Use Array.slice() to get the desired argument at index n.

const nthArg = n => (...args) => args.slice(n)[0];

const third = nthArg(2);
third(1,2,3); // 3
third(1,2); // undefined
const last = nthArg(-1);
last(1,2,3,4,5); // 5