Question

How to check if a number evaluates to positive infinity in JavaScript

Answer 1

var n = Number.MAX_VALUE * 3;

if (n == Number.POSITIVE_INFINITY)
   document.write("yes");
else   
   document.write("no");
  
/*
run:

yes 

*/

 

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Answer 2

var n = Number.MAX_VALUE;

if (n == Number.POSITIVE_INFINITY)
   document.write("yes");
else   
   document.write("no");
  
/*
run:

no 

*/

 

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Answer 3

var n = Number.MAX_VALUE * 2;

if (isFinite(n))
   document.write("yes");
else   
   document.write("no");
  
/*
run:

no 

*/

 

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Answer 4

var n = Number.MAX_VALUE;

if (isFinite(n))
   document.write("yes");
else   
   document.write("no");
  
/*
run:

yes 

*/

 

70+ SQL courses for beginners and professionals