Javascript isFinite()

Introduction

The Javascript isFinite() function checks if a value is a finite number.

If needed, the parameter is converted to a number.

It returns false if the argument is positive or negative Infinity or NaN or undefined.

Otherwise, true. 

isFinite(testValue)
Parameters Meaning
testValue The value to be tested for finiteness.
let a = isFinite(Infinity);
console.log(a);//  w  ww  . ja  v  a 2s  .c o m
a = isFinite(NaN);
console.log(a);
a = isFinite(-Infinity);
console.log(a);
a = isFinite(0);
console.log(a);
a = isFinite(2e64);
console.log(a);
a = isFinite(910);
console.log(a);
a = isFinite(null);
console.log(a);
a = isFinite('0');
console.log(a);



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