How to do [:] like in Python but in JavaScript?

Question

in Python, you can get a list like this (array in JavaScript)

a = ["one", "two", "three"]
print(a[:]) # ["one", "two", "three"]

I'm wondering how I can do this too but in JavaScript. If it is possible, please tell me :)

if a[:] does a shallow copy of a, then the equivalent would be [...a] — Ramesh Reddy
– Ramesh Reddy, Commented Dec 25, 2021 at 6:57
what if I wanted to do a[:1] to get only ["one", "two"]? @RameshReddy — bd023
– bd023, Commented Dec 25, 2021 at 7:09
Does this answer your question? JavaScript take part of an array — user202729
– user202729, Commented Dec 25, 2021 at 7:27
Don't ask "how can I do the equivalent of <language X code> in language Y?", unless that is the only way you can describe the problem. It is much better to ask directly how to do the thing that you want the code to do - in this case, either copy (if you specifically mean [:]) or slice (the general concept) the Javascript array. And having figured this out, you are well on your way to using a search engine to find an answer. — Karl Knechtel
– Karl Knechtel, Commented Dec 25, 2021 at 7:49
Please also only tag languages that are relevant to the problem itself, not to how you have decided to describe the problem. Just as you wouldn't tag your IDE unless you were asking a question about how to use the IDE. A question should only have multiple language tags if you must write code in each tagged language in order to solve the problem and that code must interoperate (if the pieces of code stand on their own, then you have separate questions about each). — Karl Knechtel
– Karl Knechtel, Commented Dec 25, 2021 at 7:51

User81646 · Accepted Answer · 2021-12-25 07:11:42Z

2

In python, a[:] creates a shallow copy of the array. The equivalent in JS is [...a].

If you just want to get the first two elements, you can use a.slice(0, 2) which returns a new array. The slice method goes from the starting index (inclusive) to the ending index (non-inclusive).

answered Dec 25, 2021 at 7:11

User81646

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1 Comment

bd023 Over a year ago

Thanks! The solution is by using the slice method. I played around with it until I eventually understand how it works.

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