CODEWITHSUNDEEP
javascriptstringparseint
user3277468
user3277468

Reputation: 141

Javascript ParseInt with positive and negative numbers

String x = "{"val" : 34, "gain": -23}"

How can I get the positve or negative number out of string. I am trying:

x.split("gain")[1]; // returns something like " : -23

parseInt(x.split("gain")[1]); // returns NaN

Upvotes: 1

Views: 2184

Answers (3)

Alex Vovchuk
Alex Vovchuk

Reputation: 2926

Don't you want to use JSON.parse(x)['gain'] ? 

let x = `{"val" : 34, "gain": -23}`
let gain = JSON.parse(x)['gain'];

console.log(gain);

Upvotes: 2

Code Maniac
Code Maniac

Reputation: 37755

Simplest thing you should do is parse JSON and access value

let x = `{"val" : 34, "gain": -23}`

console.log(JSON.parse(x).gain)

You need to change the string to parse able state by removing anything which is not a valid number before parsing it with parseInt

[^+-\d]+

This above pattern means match anything except +, - or any digit and then we replace matched value by empty string

let x = `{"val" : 34, "gain": -23}`.split("gain")[1]

console.log(parseInt(x.replace(/[^+-\d]+/g,'')))

Upvotes: 2

Uche Emmanuel
Uche Emmanuel

Reputation: 33

String x = "{"val" : 34, "gain": -23}"

How can I get the positve or negative number out of string. I am trying:

x.split("gain")[1]; // returns something like " : -23 parseInt(x.split("gain")[1]); // returns NaN

Replace : and trim string

let s = x.split("gain")[1].replace(":", "").trim();

parseInt(s);

Or

Change the x value to a proper object

let x = { val : 34, gain : - 23}

Then get gain as in x.gain this will return - 23

Upvotes: 1

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