How to check if a string is a float/int and not a NaN in Angular8?

Question

I couldn't find any answers relevant to Angular8

developer.mozilla.org/de/docs/Web/JavaScript/Reference/…

jsadev.net
– jsadev.net

2019-12-20 11:15:18 +00:00
Commented Dec 20, 2019 at 11:15 — jsadev.net
– jsadev.net, Commented Dec 20, 2019 at 11:15

StepUp · Accepted Answer · 2019-12-20 11:28:37Z

4

TypeScript is a superset of JavaScript. So we can use JavaScript code in TypeScript with some slight modifications:

isIntOrFloat(n){
    return !isNaN(n);
}

Vanilla JavaScript version:

function isIntOrFloat(n){
    return !isNaN(n);
}        
    
console.log(`is int 1? ${isIntOrFloat("1")}`)
console.log(`is int 1.5? ${isIntOrFloat("1.5")}`)
console.log(`is int a? ${isIntOrFloat('a')}`)
console.log(`is int b? ${isIntOrFloat('b')}`)

edited Dec 20, 2019 at 11:28

answered Dec 20, 2019 at 11:21

StepUp

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BLACKMAMBA · Accepted Answer · 2019-12-20 11:25:43Z

2

As StepUp mentioned, typescript is a superset of javascript, you can use all javascript functionalities inside typescript.

const notNumber= (str) => isNaN(str)

notNumber(12)// returns false

notNumber("sd")// returns false

answered Dec 20, 2019 at 11:25

BLACKMAMBA

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