I'm working with arrays of arrays in TypeScript and I'd like to efficiently splice them to retrieve the first element of each sub-array. While it's not a particularly difficult task, I'm looking for a more succinct approach.
Below is an example in Python that demonstrates what I'm trying to achieve in TypeScript:
l1 = [[1,2],[3,4],[5,6]]
l2 = [i[0] for i in l1]
print(l2) # [1, 3, 5]
To manipulate each set of data within an array, you would utilize the map method. This involves passing a function to map that processes each sub-array and returns only its first value:
const input = [[1, 2], [3, 4], [5, 6]]
const output = input.map(subarray => subarray[0])
console.log(output) // => [1, 3, 5]
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