Question

How to use isfinite() function to check if the given number has finite value in JavaScript

Answer 1

document.write(isFinite(Infinity) + "<br />");  
document.write(isFinite(-Infinity) + "<br />");   
document.write(isFinite(NaN) + "<br />");         
  
 
/*
run

false
false
false
 
*/

 

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Answer 2

document.write(isFinite(0) + "<br />");  
document.write(isFinite(null) + "<br />");   
document.write(isFinite(13e32) + "<br />");         
document.write(isFinite(1/0) + "<br />");         
  
 
/*
run

true
true
true
false
 
*/

 

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Answer 3

// the parameter is first converted to a number

document.write(isFinite("100") + "<br />");  
 
 
/*
run

true
 
*/

 

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