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]
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);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 );