Get number from the string JS / Lodash / TypeScript

Question

I have a link that comes in as a string, for example:

 let data = [
         '/api/customer’,
         '/api/customer/123’,
         '/api/customer/123/details’
    ];

I need to extract the numeric ID if there is one. The only way I found is trough _.isNaN():

const myStrArray = type.split('/');
const numericsArray = _.filter(myStrArray, urlPart => !_.isNaN(parseInt(urlPart, 10)));
const id = numericsArray[0]; // undefined/123

Is there a better way to do this?

Answer 1

You can iterate the array with Array.flatMap() (or lodash _.flatMap() ), and use String.match() with a RegExp to get a sequence of numbers.

Note: this RegExp assumes that these are the only numbers in the string. You might want to fine tune it, if there's a possibility for other numbers.

  let data = [ '/api/customer', '/api/customer/123', '/api/customer/123/details' ]; const result = data.flatMap(str => str.match(/\\d+/)); console.log(result); 

Answer 2

User regex and Array#map and Array#flat like so. You need to use ||[] in case a number was not found.

 const data = [ '/api/custome', '/api/customer/123', '/api/customer/123/details' ]; const res = data.map(a=>a.match(/\\d+/)||[]).flat(); console.log(res);