How to print Odd and Even numbers in Javascript

Question

I'm trying to merge this two codes to run as a working function that print out odd and even numbers. but I don't know on how to use a var

let num = [1,2,3,4,5,6,7,8,9,];

console.log('even numbers are');
for (var i = 1 ; i < 10 ; i += 2 ) {
   console.log(i);
}


console.log('odd numbers are ');
for (var i = 2 ; i < 10 ; i += 2 ) {
  console.log(i);
}

Help. Thanks

Does this answer your question? [How to determine if a number is odd in JavaScript](https://stackoverflow.com/questions/5016313/how-to-determine-if-a-number-is-odd-in-javascript) — JΛYDΞV, Mar 28 '21 at 02:30

score 2 · Answer 1 · answered Mar 28 '21 at 02:27

2

const isOdd = (n) => (n & 1) === 1;

const num = [1,2,3,4,5,6,7,8,9];

console.log( `Odd numbers are ${ num.filter( n => isOdd(n))}` );
console.log( `Even numbers are ${ num.filter( n => !isOdd(n))}`);

answered Mar 28 '21 at 02:27

somewhatsapient

390
2
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10

I dont understand the (n) and the arrow sign – ArChem Peralta Mar 28 '21 at 02:54
That's an arrow function, syntactic sugar for a function assignment. You could also say `const isOdd = function(n) { return n & 1 === 1 }` – somewhatsapient Mar 28 '21 at 02:56

hussains8 · Answer 2 · 2021-04-01T04:43:18.323

1

Use below code to print out Even Numbers and in the same way you can get Odd numbers list given in an Array

    var arr = [1, 2, 3, 4, 5, 6];

    for (var i = 0; i < arr.length; i++) {
        if (arr[i] % 2 === 0) {
            console.log(arr[i] + "");
        }
    }

If you are trying to put your JS code inside HTML Page, refer to the link for more details Find Even Numbers in JS

edited Apr 01 '21 at 04:43

answered Mar 28 '21 at 02:30

hussains8

634
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Im using only javascript so i have no idea about the %, and the document.write – ArChem Peralta Mar 28 '21 at 02:55
Well, you can use console.log method to print out numbers instead of document. Write method and % is an arithmetic operator to check reminder. If Num%2==0(0 is a reminder) it means Number is Even – hussains8 Mar 28 '21 at 03:07
what should i console log? – ArChem Peralta Mar 28 '21 at 04:28
just print numbers using Console.log(arr[i]) – hussains8 Mar 28 '21 at 04:40
good to listen. provide positive feedback if it helped so other community can also take benefit of that – hussains8 Mar 28 '21 at 05:01
and vote this post for maximum reach – hussains8 Mar 28 '21 at 05:15
tried to use console.log(arr[i]) it says not arr is not defined – ArChem Peralta Apr 01 '21 at 03:44
@ArChemPeralta, please check Array is defined or not like var arr=[1,2] as defined in first coding line and if still problem persists do let me know – hussains8 Apr 01 '21 at 04:39

How to print Odd and Even numbers in Javascript

2 Answers2