"isNaN" Code Answer's
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compare NaN in javascript if condititon
Vishal090
on May 18, 2020
// 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 .......
}
Source: stackoverflow.com
javascript check if is nan
Grepper
on Aug 05, 2019
function isNaN(x) {
return x !== x;
};
isNaN(NaN);//trueisNaN
Holy
on Feb 26, 2021
function milliseconds(x) {
if (isNaN(x)) {
return 'Not a Number!';
}
return x * 1000;
}
console.log(milliseconds('100F'));
// expected output: "Not a Number!"
console.log(milliseconds('0.0314E+2'));
// expected output: 3140
Source: developer.mozilla.org
isNan
Pha Kyu
on Jun 04, 2021
const fail = 10 / "zero";
console.log(fail); // NaN (Not a Number)
console.log(isNaN(fail)); // true
console.log(isNaN(10)); // false
console.log(isNaN('10')); // false
console.log(isNaN('blabla')); // true
console.log(isNaN(true)); // false
console.log(1.7976931348623157e+308 * 1000); // Infinity
console.log(1.7976931348623157e+308 * -1000); // - Infinity
console.log(10 / 0); // Infinity
console.log(isFinite(123)); // true
Source: 127.0.0.1
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