JavaScript array element to string

Question

i have a simple array and i want to generate string which include all the elements of the array, for example:

The array is set as follow:

array[0] = uri0
array[1] = uri1
array[2] = uri2

And the output string must be

teststring = uri0,uri1,uri2

I've tried to make this following way (using for loop):

var teststring = "";
teststring = teststring+array[y]

but in the firebug console i see an error message:

"teststring is not defined"

I don't know, what I'm doing wrong. Can someone give me a hint?

James · Accepted Answer · 2009-08-30 10:36:24Z

13

You must use the join function on the array:

var teststring = array.join(",");

edited Aug 30, 2009 at 10:36

James

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answered Aug 30, 2009 at 10:32

mck89

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Comments

austin cheney · Accepted Answer · 2009-08-30 10:40:03Z

11

array.join();

That is the correct answer. If no value is supplied to the join method a comma is the default element separator. Use the following if you don't want any separator at all:

array.join("");

answered Aug 30, 2009 at 10:40

austin cheney

1 Comment

demongolem Over a year ago

Like the default explanation. Shows more in depth knowledge

dfa · Accepted Answer · 2009-08-30 10:32:24Z

7

array.join(",")

edited Aug 30, 2009 at 10:32

dfa

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answered Aug 30, 2009 at 10:31

Glenn

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Comments

SridharKritha · Accepted Answer · 2019-01-30 12:40:04Z

0

For comma based join, you could use toString() method of Object.prototype (Array object internally inherit it automatically). For other separator based join use join method of the Array object.

var array = [];
array[0] = 'uri0';
array[1] = 'uri1';
array[2] = 'uri2';

console.log(array.toString()); // uri0,uri1,uri2

console.log(array.join(" £ ")); // uri0 £ uri1 £ uri2

Other possible option is implicit type coercion:

// String conversion by implicit coercion
// using '+ operator' and empty string operand ('' , [])
console.log(array + ''); // uri0,uri1,uri2
console.log(array + []); // uri0,uri1,uri2

edited Jan 30, 2019 at 12:40

answered Jan 28, 2019 at 15:42

SridharKritha

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