Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
1.2k views
in Technique[技术] by (71.8m points)

javascript - What's the equivalent of a list comprehension like this one in ES2016 or greater?

Python 3.6:

[f"Cat #{n}" for n in range(5)]

gives

['Cat #0', 'Cat #1', 'Cat #2', 'Cat #3', 'Cat #4']

New to JavaScript, What's the equivalent in new EcmaScript?

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

Array comprehension in JS was proposed for ES2016, but never made it to the final release. Firefox supported comprehensions for a time, but the support was dropped in later versions.

You can use Array#from to get something close to comprehension.

const result = Array.from({ length: 5 }, (_, k) => `Cat #${k}`);

console.log(result);

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...