I know this could be quite simple for someone else but I can't think of any solution.
I have an array called breadcrumb with the following elements breadcrumb = [a, b, c, d]
I also know the index of b. How do I pop all other elements from the array after index of b in JavaScript. the final array should look like this
breadcrumb = [a, b]
There's the slice method in the Array prototype :
var breadcrumb = ['a', 'b', 'c', 'd'];
// in case you have to find the index of the element
var index = breadcrumb.indexOf('b');
breadcrumb = breadcrumb.slice(0, index + 1) // now breadcrumb = ['a', 'b'];
splice is recommended.Im pretty sure the accepted answer from this SO question is exactly what you are looking for:
var array = ['one', 'two', 'three', 'four'];
array.length = 2;
alert(array);
You should use array.splice to remove from next element
Syntax: array.splice(index, deleteCount)
var data= ['a', 'b', 'c', 'd'];
data.splice(1+1);
console.log(data)
array.splice(start, deleteCount[, item1[, item2[, ...]]]) vs arr.slice([begin[, end]]) seemed obvious to me that slice was for keeping part of an array while splice was for popping a specific piece. I was wrong though. Thanks for the clarificationThere are various ways of achieving this.
As you said you know the index of the position from where you need to pop all the elements 1.
var position=2
var breadcrumb = [a, b, c, d];
var length=breadcrumb.length;
var loop;
for(loop=position;loop<length;loop++)
breadcrumb.pop();
2. You can use slice to do this.
var position=2;
var breadcrumb = ["a", 'b', 'c', 'd'];
var length=breadcrumb.length;
var result_arr=breadcrumb.slice(0,position);
3.You can also use splice to do this
var position=2;
var breadcrumb = ["a", 'b', 'c', 'd'];
var length=breadcrumb.length;
var result_arr=breadcrumb.splice(0,position);
var ?