Find if variable is divisible by 2

Question

How do I figure out if a variable is divisible by 2? Furthermore I need do a function if it is and do a different function if it is not.

Answer 1

array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

array.each { |x| puts x if x % 2 == 0 }

ruby :D

2 4 6 8 10

Answer 2

Use Modulus, but.. The above accepted answer is slightly inaccurate. I believe because x is a Number type in JavaScript that the operator should be a double assignment instead of a triple assignment, like so:

x % 2 == 0

Remember to declare your variables too, so obviously that line couldn't be written standalone. :-) Usually used as an if statement. Hope this helps.

Answer 3

Hope this helps.

let number = 7;

if(number%2 == 0){      

  //do something;
  console.log('number is Even');  

}else{

  //do otherwise;
  console.log('number is Odd');

}

Here is a complete function that will log to the console the parity of your input.

const checkNumber = (x) => {
  if(number%2 == 0){      

    //do something;
    console.log('number is Even');  

  }else{

    //do otherwise;
    console.log('number is Odd');

  }
}

Answer 4

You don't need jQuery. Just use JavaScript's Modulo operator.

Answer 5

You can do it in a better way (up to 50 % faster than modulo operator):

odd: x & 1 even: !(x & 1)

Reference: High Performance JavaScript, 8. ->Bitwise Operators

Answer 6

Use modulus:

// Will evaluate to true if the variable is divisible by 2
variable % 2 === 0