FIFO behavior for Array.pop in javascript? [duplicate]

Question

I want an Array method similar to Array.pop() that exhibits First In First Out behavior, instead of the native FILO behavior. Is there an easy way to do so?

Imagine a javascript console:

>> array = [];
>> array.push(1);
>> array.push(2);
>> array.push(3);
>> array.fifopop();
1      <-- array.pop() yields 3, instead

use array.shift() .... or use array.unshift() instead of array.push() then keep using array.pop() ... shift/unshift works on array "top" ... push/pop works on array "bottom" — Jaromanda X
– Jaromanda X, Commented Jan 5, 2016 at 22:31
Aa shift() is expensive on large arrays, you may want to use the tiny tiny-queue library instead. — MortezaE
– MortezaE, Commented Oct 19, 2018 at 22:02

Community · Accepted Answer · 2018-02-12 16:52:52Z

52

You can use array.prototype.shift()

>> array = [];
>> array.push(1);
>> array.push(2);
>> array.push(3);
>> array.shift();  //outputs 1 and removes it from the array

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

edited Feb 12, 2018 at 16:52

CommunityBot

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answered Jan 5, 2016 at 22:34

Deblaton Jean-Philippe

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TheHans255 · Accepted Answer · 2016-01-05 22:34:22Z

7

The method is array.shift(). It pulls the first array element much as array.pop() pulls the last element.

answered Jan 5, 2016 at 22:34

TheHans255

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