simple string split is returning object instead array

Question

I'm trying a simple string split in NodeJS, but it is returning an object, not array.

var mytext = "a,b,c,d,e,f,g,h,i,j,k";
var arr = mytext.split(",");
console.log(typeof mytext); <======= output string
console.log(typeof arr);    <======= output object

jsfiddle: http://jsfiddle.net/f4NnQ/

why?

I've been amazed on this.. I have a string, splitting using \r\n, and somehow it becomes an object. I'm using the clipboard onpaste to grab the string, but definitely can't understand what it's doing.. When I use control.log, it appears as an array.. Even tried JSON.parse(JSON.stringify(s)) to switch, but still an object. All I can say is use push() and pop() to work with it.. Hopefully I can figure this one out.... — thphoenix
– thphoenix, Commented Apr 29, 2021 at 14:19

thefourtheye · Accepted Answer · 2014-04-01 13:05:38Z

14

The output of String.prototype.split is an Array and that is an Object.

console.log(typeof []);
// object

You can confirm that the returned object is an array, like this

console.log(Object.prototype.toString.call(arr));
// [object Array]
console.log(arr);
// [ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k' ]

Quoting from the MDN Documentation of String.prototype.split,

The split() method splits a String object into an array of strings by separating the string into substrings.

answered Apr 1, 2014 at 13:05

thefourtheye

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1 Comment

Kevin Danikowski Over a year ago

I did this, but console.log(typeof arr) gives "string" not "array", did I miss something?

Adil Shaikh · Accepted Answer · 2014-04-01 13:07:16Z

2

Arrays are objects in javascript.

If you want to check if its an array -

you can do -

Array.isArray(arr)

answered Apr 1, 2014 at 13:07

Adil Shaikh

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Comments

UdhayaGirish · Accepted Answer · 2014-04-01 13:09:39Z

1

Split method always returns an array . Array is an object in javascript. If you want to check whether it is an array use Array.isArray(arr)

answered Apr 1, 2014 at 13:09

UdhayaGirish

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Smeegs · Accepted Answer · 2014-04-01 13:06:57Z

0

An array is an object.

Read about typeof results here

answered Apr 1, 2014 at 13:06

Smeegs

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Siva Charan · Accepted Answer · 2014-04-01 13:08:21Z

0

If you output as

console.log(arr);

You will see an array

answered Apr 1, 2014 at 13:08

Siva Charan

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kag · Accepted Answer · 2014-04-01 13:12:41Z

0

var mytext = "a,b,c,d,e,f,g,h,i,j,k";
var arr = mytext.split(",");
console.log(typeof mytext); <======= output string
console.log(arr);    `this will return object`
for(i=0;i<=10; i++){
console.log(arr[i]);    
}

answered Apr 1, 2014 at 13:12

kag

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