Translating Python's slicing assignment syntax to JavaScript/TypeScript: A guide

Question

Currently, I am in the process of converting a Python library into TypeScript.

One specific challenge I am facing is translating this line of code from this particular repository:

is_prime[start - segment_min::pk] = repeat(False, len(range(start - segment_min, segment_len, pk)))

While I understand that it involves Python slicing assignment, I'm uncertain about how to replicate this functionality in JavaScript/Typescript.

Could someone please provide guidance on how I can achieve this in JavaScript or TypeScript?

Answer 1

Answer №1

To accomplish a basic slicing assignment in JS, the code

target[t_start:t_end] = source[s_start:s_end]

can be implemented by utilizing both the splice and slice Array methods:

target.splice(tStart, tEnd-tStart, ...source.slice(sStart, sEnd));

It is worth noting that JavaScript doesn't natively support a step parameter for slicing, so if needed, you'll need to craft your own loop.

Answer 2

To accomplish a basic slicing assignment in JS, the code

target[t_start:t_end] = source[s_start:s_end]

can be implemented by utilizing both the splice and slice Array methods:

target.splice(tStart, tEnd-tStart, ...source.slice(sStart, sEnd));

It is worth noting that JavaScript doesn't natively support a step parameter for slicing, so if needed, you'll need to craft your own loop.