Array.from has a second argument
Written by Stefan Judis
- Published at
- Updated at
- Reading time
- 1min
This post is part of my Today I learned series in which I share all my web development learnings.
I followed a Twitter conversation between Surma from Google and Andrea Giammarchi in which Andrea mentionied that Array
accepts a second argument. 😲
console.log(Array.from([1, 2, 3], x => x + x));
// [2, 4, 6]
The snippet they discussed showed functionality to call a callback
X times.
// call a callback `length` times
Array.from({length}, () => callback())
// or generate a random emoji Array
Array.from(
{length: 7},
(v, i) => String.fromCodePoint(
129300 + Math.floor(Math.random() * 20)
)
);
// [ '🤡', '🤗', '🤥', '🤛', '🤤', '🤦', '🤔' ]
You can read more about Array
on MDN.
Was this TIL post helpful?
Yes? Cool! You might want to check out Web Weekly for more quick learnings. The last edition went out 24 days ago.
Yes? Cool! You might want to check out Web Weekly for more quick learnings. The last edition went out 24 days ago.