CODEWITHSUNDEEP
javascript
neojakey
neojakey

Reputation: 1663

Javascript array from string of numbers

I am trying to work with arrays in javascript. Consider the following code:

 var visList = '1234,5678,9'
 var visListArray = new Array(visList);
 for (i = 0; i <= visListArray.length - 1; i++)
 {
      alert(visListArray[i]);
 }

Why doesn't this split the array into individual numbers instead of all of them clumped together?

Any help would be really appreciated.

Many thanks

Upvotes: 0

Views: 1460

Answers (4)

gilly3
gilly3

Reputation: 91667

Create the array by calling split() on the string:

var visList = '1234,5678,9'  
var visListArray = visList.split(",");

You cannot substitue a string that looks like code for actual code. While this would work:

var visListArray = new Array(1234,5678,9);

Yours doesn't because the string is not interpreted by the Array constructor as 3 comma separated arguments, it is interpreted as one string.

Edit: Note that calling split() on a string results in an Array of strings. If you want an Array of numbers, you'll need to iterate the Array converting each string to a number. One convenient way to do that is to use the map() method:

visListArray = visList.split(",").map(function (item) {
    return +item;
});

See the compatibility note for using map() in older browsers.

Upvotes: 8

Eliseu Monar dos Santos
Eliseu Monar dos Santos

Reputation: 942

To convert a symbol-separated list into an array, you may use split(symbol):

var list = "1221,2323,4554,7667".split(",");
for (var i = 0, il = list.length; i < il; i++) {
    alert( +list[i] ); // a casting from string to number
}

Upvotes: 1

amit_g
amit_g

Reputation: 31270

You have to use string.split 

var visList = '1234,5678,9'
var visListArray = visList.split(",");

for (i = 0; i <= visListArray.length - 1; i++)
{
    alert(visListArray[i]);
}

Upvotes: 1

Shlomi Komemi
Shlomi Komemi

Reputation: 5545

because its an string, try this:

var visList = '1234,5678,9'
var visListArray = [].concat(visList.split(','));
for (i = 0; i <= visListArray.length - 1; i++) {
    alert(visListArray[i]);
}

Upvotes: 1

Related Questions