java script how to convert a string to number array

Question

I have a string named :

graph_data =[16.665,0,16.665,19.23,35.79,16.665,31.71,16.665,0,16.665,0,16.665,16.665,41.615]

I wanted to covert it to array of number. I am using the following code:

var graph_data1=new Array();
var graph_data = graph_data.split(",");
for (var i=0; i<graph_data.length; i++)
{
graph_data1[i] = parseFloat(graph_data[i]);
}

the output of graph_data1 is showing following NaN,0,16.665,19.23,35.79,16.665,31.71,16.665,0,16.665,0,16.665,16.665,41.615

can any one tell me why it is adding Nan and 0

thanks in advance .

if your string is indeed a string, the first element after split would be [16.665 which is NaN ... your second element is 0, which is why you get a 0 — Jaromanda X
– Jaromanda X, Commented Aug 4, 2015 at 10:02

potatopeelings · Accepted Answer · 2015-08-04 10:13:22Z

7

You could do this quite easily with JSON.parse

var myArray = JSON.parse('[16.665, 0, 16.665, 19.23, 35.79, 16.665, 31.71, 16.665, 0, 16.665, 0, 16.665, 16.665, 41.615]')

and if you want to do it all at one shot a replace to remove the content before [

var myArray = JSON.parse('graph_data = [16.665, 0, 16.665, 19.23, 35.79, 16.665, 31.71, 16.665, 0, 16.665, 0, 16.665, 16.665, 41.615]'.replace(/.*\[/,'['))

edited Aug 4, 2015 at 10:13

answered Aug 4, 2015 at 10:08

potatopeelings

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4 Comments

BenM Over a year ago

Not if the string begins with graph_data = you couldn't.

potatopeelings Over a year ago

good point! A substring or replace should fix that. editing in a bit.

Ward D.S. Over a year ago

damn, way faster than me :<

ShaneQful Over a year ago

Little annoyed with myself that I didn't think of this, my substring answer below is looking a little stupid right now :)

ShaneQful · Accepted Answer · 2015-08-04 10:07:55Z

0

Issue is that your code is trying to parse the "[" character as a number use substring to get around this like below:

var graph_data="[16.665,0,16.665,19.23,35.79,16.665,31.71,16.665,0,16.665,0,16.665,16.665,41.615]";
var graph_data1=[];
var graph_data = graph_data.substring(1, graph_data.length - 2).split(",");
for (var i=0; i<graph_data.length; i++)
{
graph_data1[i] = parseFloat(graph_data[i]);
}

answered Aug 4, 2015 at 10:07

ShaneQful

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Comments

Faizan A. Chughtai · Accepted Answer · 2015-08-04 10:09:00Z

0

When you are using

graph_data.split(',');

it is taking the first number as

[16.665

you need to remove [ from your number you can do that by simply doing

graph_data1[i] = parseFloat(graph_data[i].replace('[',''));

although this is not good practice but it will do the job for you.

answered Aug 4, 2015 at 10:09

Faizan A. Chughtai

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Comments

Ward D.S. · Accepted Answer · 2015-08-04 10:13:45Z

0

Much easier, just json parse from the start to the end of the array:

var myString = "graph_data =[16.665,0,16.665,19.23,35.79,16.665,31.71,16.665,0,16.665,0,16.665,16.665,41.615]";
var startInd = myString.indexOf('[');
var endInd = myString.indexOf(']')+1; //+1 to include the ]
var myIntArr = JSON.parse(myString.substring(startInd, endInd));
console.log(myIntArr) // [16.665,0,16.665,19.23,35.79,...]

answered Aug 4, 2015 at 10:13

Ward D.S.

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Comments

Aefits · Accepted Answer · 2015-08-04 10:30:24Z

0

You can try below code:

graph_data='[16.665,0,16.665,19.23,35.79,16.665,31.71,16.665,0,16.665,0,16.665,16.665,41.615]'
var regexp = /(\+|-)?((\d+(\.\d+)?)|(\.\d+))/gi;
var matches_array = graph_data.match(regexp);
graph_data_array = matches_array.map(function (t) {
        return t;
    });
console.log(graph_data_array)

answered Aug 4, 2015 at 10:30

Aefits

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Comments

Vishnu Atrai · Accepted Answer · 2015-08-06 16:38:28Z

0

Use JSON.parse instead

graph_data  ="[16.665,0,16.665,19.23,35.79,16.665,31.71,16.665,0,16.665,0,16.665,16.665,41.615]"

graph_data = JSON.parse(graph_data)

console.log(graph_data)
=> [16.665, 0, 16.665, 19.23, 35.79, 16.665, 31.71, 16.665, 0, 16.665, 0, 16.665, 16.665, 41.615]

edited Aug 6, 2015 at 16:38

answered Aug 4, 2015 at 10:09

Vishnu Atrai

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