Answers for "isnan in javascript"

Javascript

javascript number.isnan vs isnan

/**
* Number.isNaN is almost identical to ES5 global isNaN method. 
* Number.isNaN returns whether the provided value equals NaN. 
* This is a very different question from “is this not a number?”.
*/

Number.isNaN({}); // <- false, {} is not NaN
Number.isNaN('ponyfoo') // <- false, 'ponyfoo' is not NaN
Number.isNaN(NaN) // <- true, NaN is NaN
Number.isNaN('pony'/'foo') // <- true, 'pony'/'foo' is NaN, NaN is NaN

isNaN({}); // <- true, {} is not a number
isNaN('ponyfoo'); // <- true, 'ponyfoo' is not a number
isNaN(NaN); // <- true, NaN is not a number
isNaN('pony'/'foo'); // <- true, 'pony'/'foo' is NaN, NaN is not a number

Posted by: Guest on July-10-2021

javascript check if is nan

function isNaN(x) {
   return x !== x;
};
isNaN(NaN);//true

Posted by: Guest on August-05-2019

compare NaN in javascript if condititon

// Use isNaN() 
// In javascript compare NaN direct alweys return false
let num1 = Number("Vishal");

// This code never work
if(num1 == NaN){  // Direct compare NaN alweys return false so use isNaN() function
  ....... Your Code .......
}  

// This code work
if(isNaN(num1){
  .........Your Code .......
}

Posted by: Guest on May-18-2020

Source

isnan in javascript

var s = userInput[0];
  if(isNaN(s) !== true)
  {
      console.log("yes");
  }
  else
  {
      console.log("no");
  }

Posted by: Guest on December-20-2020

isNaN javascript

var j ="Hello World" // isNaN (j) returns true
  var n = 15; // isNaN (n) returns false

  if(isNaN(n) == true)   // NaN means >> Not a Number
  {
      console.log("yes, it's a string");
  }
  else
  {
      console.log("no, it's a number");
  }

Posted by: Guest on May-11-2021

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