I want to remove a range of elements from an array
Let's assume I have an array with given values
let arr = [33,44,56,88,332,67,88,33]
I gave a range as an input let's say from index 3 to index 6. The output I want: [33,44,56,33]
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A simple for loop?mighty_dev– mighty_dev2022-05-30 18:03:29 +00:00Commented May 30, 2022 at 18:03
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2 Answers
Using Array.prototype.slice and Array.prototype.concat
const
arr = [33, 44, 56, 88, 332, 67, 88, 33],
startIndex = 3,
endIndex = 6,
newArr = arr.slice(0, startIndex).concat(arr.slice(endIndex + 1));
console.log(newArr);Using Array.prototype.slice and spread (...)
const
arr = [33, 44, 56, 88, 332, 67, 88, 33],
startIndex = 3,
endIndex = 6,
newArr = [...arr.slice(0, startIndex), ...arr.slice(endIndex + 1)];
console.log(newArr);Using Array.prototype.splice
Note: splice alters the original array.
const
arr = [33, 44, 56, 88, 332, 67, 88, 33],
startIndex = 3,
endIndex = 6;
arr.splice(startIndex, endIndex - startIndex + 1);
console.log(arr);
answered May 30, 2022 at 18:00
Som Shekhar Mukherjee
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Comments
For explicitly removing an array element you can do this:
let arr = [ 33, 44, 56, 88, 332, 67, 88, 33 ];
delete arr [ 3 ]; // the array length doesn't change!
console.log( arr );To remove a range in an array, you could try this:
let startIndex = 3;
let stopIndex = 6;
let lengthToRemove = (stopIndex + 1) - startIndex;
let arr = [ 33, 44, 56, 88, 332, 67, 88, 33 ];
arr.splice( startIndex, lengthToRemove );
console.log( arr );
4 Comments
LHS
Hey @robni, the only problem with
arr.splice(startingPoing, length) i can't give length, as length can be dynamic
robni
So how do you know the length? Did you want to stop at a specific value? Say your range should be start by value 88 and stop by the value 33? Note: the second parameter (lengthToRemove) is the amount of elements to remove from the startingpoint (startingPoint). If you don't know the amount, you need to know when you want to "stop" the splice.
LHS
I don't know about the length, the only thing I know is a range, from index 3 to index 6 (3,6) or index 1 to index 4 (1,4) @robni
robni
I edited my answer. The lengthToRemove is now calculated.