Question

How to check whether a value is a finite number using Number.isFinite() method in JavaScript

Answer 1

document.write("13: " + Number.isFinite(13) + "<br />"); //true
document.write("0: " + Number.isFinite(0) + "<br />"); //true
document.write("-15: " + Number.isFinite(-15) + "<br />"); //true
document.write("-3.14: " + Number.isFinite(-3.14) + "<br />"); //true
document.write("'19': " + Number.isFinite('19') + "<br />"); //false
document.write("\"19\": " + Number.isFinite("19") + "<br />"); //false
document.write("'abc': " + Number.isFinite('abc') + "<br />"); //false
document.write("Infinity: " + Number.isFinite(Infinity) + "<br />"); //false
document.write("-Infinity: " + Number.isFinite(-Infinity) + "<br />"); //false
document.write("5/0: " + Number.isFinite(5/0) + "<br />"); //false
document.write("2017/4/14: " + Number.isFinite(2017/4/14) + "<br />"); //true
  
/*
run:

13: true
0: true
-15: true
-3.14: true
'19': false
"19": false
'abc': false
Infinity: false
-Infinity: false
5/0: false
2017/4/14: true

*/

 

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