Javascript array search and remove string?
JavascriptArraysJavascript Problem Overview
I have:
var array = new Array();
array.push("A");
array.push("B");
array.push("C");
I want to be able to do something like:
array.remove("B");
but there is no remove function. How do I accomplish this?
Javascript Solutions
Solution 1 - Javascript
I'm actually updating this thread with a more recent 1-line solution:
let arr = ['A', 'B', 'C'];
arr = arr.filter(e => e !== 'B'); // will return ['A', 'C']
The idea is basically to filter the array by selecting all elements different to the element you want to remove.
Note: will remove all occurrences.
EDIT:
If you want to remove only the first occurence:
t = ['A', 'B', 'C', 'B'];
t.splice(t.indexOf('B'), 1); // will return ['B'] and t is now equal to ['A', 'C', 'B']
Solution 2 - Javascript
Loop through the list in reverse order, and use the .splice
method.
var array = ['A', 'B', 'C']; // Test
var search_term = 'B';
for (var i=array.length-1; i>=0; i--) {
if (array[i] === search_term) {
array.splice(i, 1);
// break; //<-- Uncomment if only the first term has to be removed
}
}
The reverse order is important when all occurrences of the search term has to be removed. Otherwise, the counter will increase, and you will skip elements.
When only the first occurrence has to be removed, the following will also work:
var index = array.indexOf(search_term); // <-- Not supported in <IE9
if (index !== -1) {
array.splice(index, 1);
}
Solution 3 - Javascript
List of One Liners
Let's solve this problem for this array:
var array = ['A', 'B', 'C'];
1. Remove only the first: Use If you are sure that the item exist
array.splice(array.indexOf('B'), 1);
2. Remove only the last: Use If you are sure that the item exist
array.splice(array.lastIndexOf('B'), 1);
3. Remove all occurrences:
array = array.filter(v => v !== 'B');
Solution 4 - Javascript
DEMO
You need to find the location of what you're looking for with .indexOf()
then remove it with .splice()
function remove(arr, what) {
var found = arr.indexOf(what);
while (found !== -1) {
arr.splice(found, 1);
found = arr.indexOf(what);
}
}
var array = new Array();
array.push("A");
array.push("B");
array.push("C");
remove(array, 'B');
alert(array);
This will take care of all occurrences.
Solution 5 - Javascript
Simply
array.splice(array.indexOf(item), 1);
Solution 6 - Javascript
Simple solution (ES6)
If you don't have duplicate element
Array.prototype.remove = function(elem) {
var indexElement = this.findIndex(el => el === elem);
if (indexElement != -1)
this.splice(indexElement, 1);
return this;
};
Solution 7 - Javascript
const changedArray = array.filter( function(value) {
return value !== 'B'
});
or you can use :
const changedArray = array.filter( (value) => value === 'B');
The changedArray will contain the without value 'B'
Solution 8 - Javascript
You have to write you own remove. You can loop over the array, grab the index of the item you want to remove, and use splice
to remove it.
Alternatively, you can create a new array, loop over the current array, and if the current object doesn't match what you want to remove, put it in a new array.
Solution 9 - Javascript
use:
array.splice(2, 1);
This removes one item from the array, starting at index 2 (3rd item)
Solution 10 - Javascript
use array.splice
/*array.splice(index , howMany[, element1[, ...[, elementN]]])
array.splice(index) // SpiderMonkey/Firefox extension*/
array.splice(1,1)
Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice
Solution 11 - Javascript
This only valid on str list, look up this
myStrList.filter(item=> !["deletedValue","deletedValue2"].includes(item))