showing results for - "javascript number isnan vs isnan"
Amanda
17 Apr 2017
1/**
2* Number.isNaN is almost identical to ES5 global isNaN method. 
3* Number.isNaN returns whether the provided value equals NaN. 
4* This is a very different question from “is this not a number?”.
5*/
6
7Number.isNaN({}); // <- false, {} is not NaN
8Number.isNaN('ponyfoo') // <- false, 'ponyfoo' is not NaN
9Number.isNaN(NaN) // <- true, NaN is NaN
10Number.isNaN('pony'/'foo') // <- true, 'pony'/'foo' is NaN, NaN is NaN
11
12isNaN({}); // <- true, {} is not a number
13isNaN('ponyfoo'); // <- true, 'ponyfoo' is not a number
14isNaN(NaN); // <- true, NaN is not a number
15isNaN('pony'/'foo'); // <- true, 'pony'/'foo' is NaN, NaN is not a number
Élie
21 Jan 2018
1  var s = userInput[0];
2  if(isNaN(s) !== true)
3  {
4      console.log("yes");
5  }
6  else
7  {
8      console.log("no");
9  }
Alessio
04 Feb 2018
1  var j ="Hello World" // isNaN (j) returns true
2  var n = 15; // isNaN (n) returns false
3
4  if(isNaN(n) == true)   // NaN means >> Not a Number
5  {
6      console.log("yes, it's a string");
7  }
8  else
9  {
10      console.log("no, it's a number");
11  }
queries leading to this page
not a number javascriptopposite of isnan javascriptisnan 3a javascriptisnan function javascriptisnan nodejsjavascript true isnanis nan javascriptjavascript isnumericjavascript check nanjavascript does isnan 28false 29isnan 0 javascriptwhat isnan in javascriptcheck whether a number is nanjavascript isnan functionisnan 280 29 javascript isnan 28 29 nodemath isnan jsjavascript isnan in javascript 2c what does isnan function do 3f select one 3ajavascript isnan 3d 3d 0isnumber javascriptuse the isnan method to check if the parameters are numbers 3bjavascript isnan 28 29js isnan 0check isnan javascriptjavascript isnan 22 22what is nan in javascriptjavascript isnan 3d 3d math isnan javascriptjs if not numbeisnan js functionhow to check nan value in jquerycheck nan in jquerywhat does isnan javascriptisnan 28 29 in javascriptwhat is isnan in javascriptjs isnan infinityisnan javascript in wordisnan jscheck if not number javascriptjavascript int nanjs is nanjavascript number isnan vs isnanisnan 28 29 js isnan 28 29 3b jsjs is isnancan i use isnan in jschecking for nan javascriptisnan javascript returnisnan javascript defineisnan 28 29 method in javascriptjavascript isnanjavascript isnan vs number isnanin javascript 2c what does isnan function do 21isnan 28number 29 29 javascriptwhat does isnan mean in jsjavascript isnan functionin javascript 2c what does isnan function do 3fisnan 28 29 javascriptnumber isnan vs isnanw3 isnan javascriptisnan meaning in javascriptjavascript number isnanwhat is isnan function in javascriptjavascript test for nanjavascript isnan stringhow to check isnan in javascriptwhat is the meaning of isnan in javascriptisnan string javascriptisnan value js method isnan javascriptwahat is isnan 28 29 in javascriptisnan functionjs chekc not nancheck if isnan jsjavascript isnan 22nan 22if number isnt nan javascriptnumber isnan jsisnan function jsjavascript isnan 0check isnan jsjavascript check number isnanisnan javascript w3schoolsjs value is nannode js isnanisnan javascriptjs es6 isnanjavascript isnan notnanhow to use isnan javascriptnumber isnan and isnan in jsisnumber jsisnan function in javascriptisnumeric javascriptnode isnanwhy isnan is used in javascriptjavascript compare isnannumber isnan nodeisnan null jsisnan jssjs isnan functionwhen number isnan true in jstonumber javascript nan equateisnumeric vs isnan javascriptjs isnanisnan javascript 0isnan javascript not workingisnan javascript meansnon isnan javascripthow to condition for nan instead of number in jscompare nan in javascripthow to check if isnan javascriptisnan 28 29how to use isnan in javascriptcheck if number is nan jsnumber isnan 28 29number isnan 28 29 javascriptisnan trong javascriptisnanin jsisnan if statement javascriptwhat is isnan jsisnan method in jsnumber isnan meaning in jsjs test nannan function in javascriptcheck for nan in javascriptjs check if something isnanvalidate nan javascriptnumber is nanisnan method in javascriptis nan function in javascriptis nan a number 3fjavascript nan isnanhow to works isnan function in javascriptjavascript isnan number isnanisnan functioun javascriptwhat can i use instead of isnan javascriptisnull javascriptjavascript detect nanjavascript isnan 28 270 27isna jsjavascript 21isnanmath isnanisnan in javascriptisnan in jsisnan en javascriptwhat is isnan methods in jswhat is isnan in javascript typenode 21isnan 28 29javascript function isnanisnan condition javascriptnan in javascriptcheck if nanwhat does isnan in javascript do if isnan javascriptmath isnanjavascript isnan 27 27difference between isnan and number isnanjs check if nanajavascript if value nanjs isnan conditionw3schools javascript isnanhow can iuse isnan in javascript to display error message in phpnot a nanjs isnan vs number isnannodejs isnanjavascript math isnanhow to write isnan function in javascriptcheck if isnan javascript 21isnan javascriptisnan method javascriptif isnan jsnot nan javascriptnode 21isnan 28value 29nan javascriptisnan function in javascript examplejs isnan for numbersjavascript isnan what isjavascript how to check isnanis nan in javascript conditionisnan 28 29 in js w3schoolsjs isnanisnotanumber javascriptjquery if not isnanhow we use isnan function in jsisnan in nodejsnumber isnan javascriptwhat is isnan function in javasciptjavascript if isnanwhat does number isnan mean in javascriptwhat does isnan function do in javascriptjavascript check isnanwhat is isnan javascriptisnan uses in javascriptjavascript number isnan vs isnan