Javascript Number isFinite()

Introduction

The Javascript Number.isFinite() method checks if the passed value is a finite number. 

Number.isFinite(value)
Parameter Optional Meaning
value Required The value to be tested.

It returns a boolean value indicating whether or not the given value is a finite number.

Unlike global isFinite() function, this method doesn't convert the parameter to a number.

It returns true for the finite number only. 

let a = Number.isFinite(Infinity);  // false
a = Number.isFinite(NaN);       // false
console.log(a);//  w  ww .j a  v  a  2 s . c om
a = Number.isFinite(-Infinity); // false
console.log(a);
a = Number.isFinite(0);         // true
console.log(a);
a = Number.isFinite(2e64);      // true
console.log(a);
a = Number.isFinite('0');       // false, true with global isFinite('0')
console.log(a);
a = Number.isFinite(null);      // false, true with global isFinite(null)
console.log(a);



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