How to Do array.map between two numbers

Question

let assume I have array

arr=[1,2,3,4,5,6,7,8,9,10]

so I want iterate based on two value one is index, and offset , for example, index=2, offet=5 expected output

newArray=[3,4,5,6,7]

I tried .slice but it is not meet the requirement

Answer 1

console.log([1,2,3,4,5,6,7,8,9,10].splice(2,5))

Answer 2

You need for Array#slice as second parameter an index, not the length of the part. Just add the index as well.

var array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
    index = 2,
    offset = 5,
    result = array.slice(index, index + offset);

console.log(result);

Answer 3

Using slice()

arr.slice([begin[, end]])

let arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
let index = 2, offset = 5

console.log(arr.slice(index, index + offset))

Using splice()

array.splice(start[, deleteCount[, item1[, item2[, ...]]]])

let arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
let index = 2, offset = 5

console.log(Array.from(arr).splice(index, offset))

Answer 4

slice() should meet your requirements:

Array.prototype.slice(index, index + offset);

Answer 5

You can slice() like this and then iterate the result using the standard map() method of Array

let arr = [1,2,3,4,5,6,7,8,9];
arr.slice(2, 6).map((element, index)=>console.log(element, index));