How to convert Char into Strings in JavaScript?

Question

I'm using the split(' ') method in JavaScript to spilt the word for whitespaces. For example:

I have text like:

var str ="Hello this is testing"

After I call

str.split(' ')

Now I will get Hello this is tesing as output and when I do this

str[2]

I get "l", but I want to get "testing" word (as per array index). How to convert str to array, so that if I put

str[2] //It should be testing.

aravinth str[2] should be the word "is" by what you are hoping to achieve — Matthew Cox
– Matthew Cox, Commented Mar 8, 2011 at 16:52

Amir Raminfar · Accepted Answer · 2011-03-08 16:51:23Z

7

When you do split it actually returns a value.

var foo = str.split(' '); foo[2] == 'is' // true foo[3] == 'testing' // true str[2] == 'l' // because this is the old str which never got changed.

answered Mar 8, 2011 at 16:51

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3 Comments

Except that foo[2] actually equals "is".

also str[2] would actually equal 'l'

you are welcome. don't forget to select a correct answer please.

gilly3 · Accepted Answer · 2011-03-08 16:50:59Z

var a = str.split(" "); // split() returns an array, it does not modify str a[2]; // returns "is"; a[3]; // returns "testing";

jondavidjohn · Accepted Answer · 2011-03-08 16:52:35Z

.split() is returning your array, it doesn't change the value of your existing variable

example...

var str = "Hello this is testing"; var str_array = str.split(' '); document.write(str_array[3]); //will give you your expected result.

Felix Kling · Accepted Answer · 2011-03-08 16:51:10Z

Strings are not mutable, split^[docs] returns an array. You have to assign the return value to a variable. E.g.:

> var str ="Hello this is testing"; undefined > str = str.split(' '); ["Hello", "this", "is", "testing"] > str[3] "testing"

SLaks · Accepted Answer · 2011-03-08 16:51:30Z

Writing str.split(" ") does not modify str.
Rather, it returns a new array containing the words.

You can write

var words = str.split(" "); var aWord = words[1];

Matthew Cox · Accepted Answer · 2011-03-08 16:57:11Z

I made this html page and it reports the following:

function getStrs() { var str = "Hello this is testing"; var array = str.split(' '); for(var i=0; i < 4; i ++) alert(array[i]); }

It reported Hello ... this ... is ... testing