Remove first element from a multi-dimension array in javascript

Question

I have an array like :

var arr = [["series0","44","24",56,12 ]]

How to trim(remove) the first element, here it is "series0" ? I already tried most predefined js function but could not find solution. Thanks all for great answers.What would be best way to sort the array, i already tried for:

.sort(function(a, b){return a-b})

and also:

arr.sort(function(a,b) {
  if (isNaN(a) || isNaN(b)) {
    return a > b ? 1 : -1;
  }
  return a - b;
});

I need the sort result should return like arr=[["series0","12","24","44","56"]] Rather i am getting [["12","24","44","56","series0"]]

@Tushar, no assignment necessary, the splice returns the spliced part/s. — Nina Scholz
– Nina Scholz, Commented Feb 25, 2016 at 9:37

Leventix · Accepted Answer · 2016-02-25 09:28:20Z

3

The shift method removes the first element, you can call it on the first element of your array:

arr[0].shift()

answered Feb 25, 2016 at 9:28

Leventix

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Comments

Pranav C Balan · Accepted Answer · 2016-02-25 10:46:07Z

1

Use splice(), by changing second parameter you can remove more than one elements

var arr = [
  ["series0", "44", "54", 56]
];
arr[0].splice(0, 1);

document.write(JSON.stringify(arr));

EDIT : In case if you just want to remove single element then shift() will be best solution

var arr = [
  ["series0", "44", "54", 56]
];
arr[0].shift();

document.write(JSON.stringify(arr));

edited Feb 25, 2016 at 10:46

answered Feb 25, 2016 at 9:27

Pranav C Balan

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4 Comments

user3172663 Over a year ago

i am curious, if i can sort the same array type that contain both string and integer.Lets say the array is like this var arr = [ ["series0", "44", "32", 56]]; After sort i would like to get the array like var arr= [["series0", "32", "44", 56]]

Pranav C Balan Over a year ago

@user3172663 : use sort()

user3172663 Over a year ago

I am trying for arr.sort(function(a, b){return a-b}); but could not get the result as i am expecting.You can find the first element of the array is string and others are integers.

Pranav C Balan Over a year ago

@user3172663 : add another question with relevant code

Adam · Accepted Answer · 2016-02-25 09:33:34Z

1

Try the .map function of Array:

var arr = [["series0", "44", "54",56 ]]
arr.map(function(arr){arr.shift()});
console.log(arr)

It'll remove all the first element of all elements of outer array.

input:

 [["series0", "44", "54",56 ],["series0", "44", "54",56 ]]

output:

[["44", "54",56 ],["44", "54",56 ]]

edited Feb 25, 2016 at 9:33

answered Feb 25, 2016 at 9:27

Adam

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Comments

Murad Hasan · Accepted Answer · 2016-02-25 09:27:27Z

0

Simply use the shift function:

Removes the first element from an array and returns only that element.

arr[0].shift();
alert(arr);

answered Feb 25, 2016 at 9:27

Murad Hasan

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Comments

John Hascall · Accepted Answer · 2016-02-25 13:11:12Z

0

Use the array shift() method:

var arr = [["series0", "44", "54",56 ]]
arr[0].shift();      // removes and returns "series0" (return ignored here)

edited Feb 25, 2016 at 13:11

John Hascall

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answered Feb 25, 2016 at 9:29

Abdul

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