How do I unset an element in an array in javascript?

Steven_Noble_10393 0
Viewed 222264

How do I remove the key 'bar' from an array foo so that 'bar' won't show up in

for(key in foo){alert(key);}
arrays javascript
8 Answers
delete foo[key];

:D

Admin1

This is how I would do it

 myArray.splice( myArray.indexOf('bar') , 1)
user_37960110

there is an important difference between delete and splice:

ORIGINAL ARRAY:

[<1 empty item>, 'one',<3 empty items>, 'five', <3 empty items>,'nine']

AFTER SPLICE (array.splice(1,1)):

[ <4 empty items>, 'five', <3 empty items>, 'nine' ]

AFTER DELETE (delete array[1]):

[ <5 empty items>, 'five', <3 empty items>, 'nine' ]

user_7917180

Array element unset

  • Using pop
var ar = [1, 2, 3, 4, 5, 6];
ar.pop(); // returns 6
console.log( ar ); // [1, 2, 3, 4, 5]
  • Using shift
var ar = ['zero', 'one', 'two', 'three'];
ar.shift(); // returns "zero"
console.log( ar ); // ["one", "two", "three"]
  • Using splice
var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
var removed = arr.splice(2,2);

var list = ["bar", "baz", "foo", "qux"];
    
list.splice(0, 2); 
// Starting at index position 0, remove two elements ["bar", "baz"] and retains ["foo", "qux"].
user_87253950
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