Mapping with parseInt over arrays

[adrfantini]

I feel like this classic gem should also be included (if it is not there already and I missed it):

[1,2,3].map(parseInt)
// [ 1, NaN, NaN ]

Explanation: map passes three arguments to parseInt for each iteration, and parseInt accepts the second argument (undefined) as radix, and fails silently. [1,2,3].map((x) => parseInt(x)) works.

Links:

• https://medium.com/dailyjs/parseint-mystery-7c4368ef7b21#:~:text=map(parseInt)%20doesn't,parsed%20using%20a%20different%20radix.&text='1'%20is%20parsed%20as%20the,its%20index%200%20is%20falsy.
• https://dev.to/jules_k/array-map-parseint-in-javascript-3ig

Doc:

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map
• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt

[denysdovhan]

Could you send a PR?