## How to determine if a number is odd in JavaScript

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Can anyone point me to some code to determine if a number in JavaScript is even or odd?

Use the below code:

function isOdd(num) { return num % 2;} console.log("1 is " + isOdd(1)); console.log("2 is " + isOdd(2)); console.log("3 is " + isOdd(3)); console.log("4 is " + isOdd(4));

**How to determine if a number is odd or even in JavaScript?,** In these times, I can assume most webdevvers use a javascript library like jQuery or similar. These libraries have functions like isEven built in. For those who don't � How to determine if a number is odd or even in JavaScript? How to Check if a Number is Odd or Even using Python? C++ Program to Check Whether Number is Even or Odd; PHP program to check if the total number of divisors of a number is even or odd; Program to check if a number is Positive, Negative, Odd, Even, Zero?

Use the bitwise `AND`

operator.

function oddOrEven(x) { return ( x & 1 ) ? "odd" : "even"; } function checkNumber(argNumber) { document.getElementById("result").innerHTML = "Number " + argNumber + " is " + oddOrEven(argNumber); } checkNumber(17);

<div id="result" style="font-size:150%;text-shadow: 1px 1px 2px #CE5937;" ></div>

**Check if Number is Even/Odd,** To find an entered number is Odd or Even is very simple, all you have to do is divide the number by 2 and if you get the remainder 0 (zero) then it is an Even number otherwise an Odd number. Eg: 10 / 2 = 5, here 5 is the quotient, 0 is the remainder. To find an entered number is Odd or Even is very simple, all you have to do is divide the number by 2 and if you get the remainder 0 (zero) then it is an Even number otherwise an Odd number. Eg: 10 / 2 = 5, here 5 is the quotient, 0 is the remainder. In JavaScript there are two operators you can use to find quotient and remainder.

You could do something like this:

function isEven(value){ if (value%2 == 0) return true; else return false; }

**JavaScript to find Odd or Even number!,** const number = 13; const isOdd = number % 2 !== 0; console.log(isOdd); true. JavaScript we are going to use as our programming language. Also, I added a “Reset” button to clear the Textbox to input another number given of the user. HTML Code. This source code where the user types the value to determine if it is Odd or Even Number. <

function isEven(x) { return (x%2)==0; } function isOdd(x) { return !isEven(x); }

**How to check if number is odd in JavaScript,** How to write a JS function to check if a number is odd or even or invalid? ( number and invalid for numbers that contain decimal fractions. Code Explanation. no=Number(document.getElementById("no_input").value); This code is used for receive input value form input field which have id no_input. <button onclick="odd_even()">Click Me</button> This code is used for call odd_even() function when button clicked.

Do I have to make an array really large that has a lot of even numbers

No. Use modulus (%). It gives you the remainder of the two numbers you are dividing.

Ex. 2 % 2 = 0 because 2/2 = 1 with 0 remainder. Ex2. 3 % 2 = 1 because 3/2 = 1 with 1 remainder. Ex3. -7 % 2 = -1 because -7/2 = -3 with -1 remainder.

This means if you mod any number x by 2, you get either 0 or 1 or -1. 0 would mean it's even. Anything else would mean it's odd.

**Check if a number is odd or even in JavaScript,** One common thing to do with conditionals is to check if a number is odd or even. If a number is evenly divisible by 2 with no remainder, then it is even. You can� To determine whether or not a number can be evenly divided into a second number all you have to do is divide the numbers and see if the answer includes a remainder. For example, 25 cannot be evenly divided by 6: if you take 6 into 25, you’ll end up with 4 and a remainder of 1 (6 x 4 = 24; 24 + 1 = 25).

**Detecting Odd and Even — AP CS Principles,** If it's not a number then throw an error. Add this method as native javascript method. Input : A number. Output : Boolean. Logic : Check the given� Traditional Method To Find Sum Of Odd Numbers. Let’s first implement the solution to the above problem using traditional method. The program will iterate from 1 to N and check for number to be odd. If the number is odd, it’s added to the total sum. Here is how the implement looks :

**Determine if a number is Odd or not,** JavaScript Program to Find whether a Number is Even or Odd with Source Code - Duration Duration: 8:18
Posted: Dec 24, 2017 A number is even if it is perfectly divisible by 2. When the number is divided by 2, we use the remainder operator % to compute the remainder. If the remainder is not zero, the number is odd. Source Code # Python program to check if the input number is odd or even. # A number is even if division by 2 gives a remainder of 0.

**How to check the number is Even or Odd in JavaScript,** Odd and Even numbers: If you divide a number by 2 and it gives a remainder of 0 then it is known as even number, otherwise an odd number. Even� Generally, it’s best practice to use === but in this example, value % 2 is guaranteed to return an integer or NaN, which allows us to absolutely know the type of variable we’re comparing on either side of num % 2 or 0, but not num itself.

##### Comments

- developer.mozilla.org/en/JavaScript/Reference/Operators/…
- @DavidThomas I partly agree, but I have two caveats: 1. If I had to choose, I'd rather a beginner programmer knew about the
`%`

operator than`&`

, and 2. While`&`

is theoretically faster, it really doesn't matter. - @kojiro: I'd rather more (valid) options be presented to a learner; plus I hadn't ever thought to use bitwise-& in this manner before, so it's an interesting take. Anyway, since it
*is*a dupe, I've flagged for merger with the pre-existing question. Hopefully, then, the answers here (that particular answer at least), won't be lost. - @kojiro I'm afraid to say that your fiddle is quite useless, since most of the computational time is taken by the function calls. But nobody will use a function call to determine if a number is odd or even... I made a third revision of your test, but I'm on my phone now...
- possible duplicate of Testing whether a value is odd or even
- Note that this will return
`0`

or`1`

(or`NaN`

if you feed it something that isn't a number and can't be coerced into one), which will work fine for most situations. But if you want a real`true`

or`false`

:`return (num % 2) == 1;`

- yea good note about the NaN. But usually, you want javascript to be truthy or falsey, which is why i wrote it the way i did.
- Just to clarify, the modulo operator (%) gives the remainder of a division. So 3%2 would be 3/2, leaving 1 as a remainder, therefore 3%2 will return 1.
- Further to what T.J. said, this will return a fraction if
`num`

isn't an integer. Which will still work if you compare`isOdd(1.5)==true`

(because a fractional value is not equal to`true`

), but it would be better if the function returned`true`

or`false`

as implied by the name "isOdd". - You can also do
`return !!(num % 2)`

to get a boolean - +1, you're answer definitely beats mine, not to mention that you have the only answer that
**does not**use`X % Y`

! - I'm not sure if my test is accurate, but the bitwise AND seems to be 40 times slower than the modulo operator for a fixed number and 2 times slower for a random number: jsperf.com/odd-or-even