How to remove item from array by value? [duplicate]

Answer 1

In all values unique, you can:

a = new Set([1,2,3,4,5]) // a = Set(5) {1, 2, 3, 4, 5}
a.delete(3) // a = Set(5) {1, 2, 4, 5} 
[...a] // [1, 2, 4, 5]

Answer 2

var remove = function(array, value) {
    var index = null;

    while ((index = array.indexOf(value)) !== -1)
        array.splice(index, 1);

    return array;
};

Answer 3

You can use underscore.js. It really makes things simple.

For example, with this:

var result = _.without(['three','seven','eleven'], 'seven');

And result will be ['three','eleven'].

In your case the code that you will have to write is:

ary = _.without(ary, 'seven')

It reduces the code that you write.

Answer 4

Simply

var ary = ['three', 'seven', 'eleven'];
var index = ary.indexOf('seven'); // get index if value found otherwise -1

if (index > -1) { //if found
  ary.splice(index, 1);
}

Answer 5

indexOf is an option, but it's implementation is basically searching the entire array for the value, so execution time grows with array size. (so it is in every browser I guess, I only checked Firefox).

I haven't got an IE6 around to check, but I'd call it a safe bet that you can check at least a million array items per second this way on almost any client machine. If [array size]*[searches per second] may grow bigger than a million you should consider a different implementation.

Basically you can use an object to make an index for your array, like so:

var index={'three':0, 'seven':1, 'eleven':2};

Any sane JavaScript environment will create a searchable index for such objects so that you can quickly translate a key into a value, no matter how many properties the object has.

This is just the basic method, depending on your need you may combine several objects and/or arrays to make the same data quickly searchable for different properties. If you specify your exact needs I can suggest a more specific data structure.

Answer 6

What you're after is filter

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

This will allow you to do the following:

var ary = ['three', 'seven', 'eleven'];
var aryWithoutSeven = ary.filter(function(value) { return value != 'seven' });
console.log(aryWithoutSeven); // returns ['three', 'eleven']

This was also noted in this thread somewhere else: https://stackoverflow.com/a/20827100/293492