modulo in javascript code example

Example 1: javascript division get remainder

var y=11;
var x=4;
var quotient = Math.floor(y/x); //2
var remainder = y % x; //3

Example 2: js modulo

// The JS % operater is REMAINDER not MODULO
// For modulo behaviour use
function mod(n, m) {
  return ((n % m) + m) % m;
}

Example 3: modulus js

//We are trying to find a table for my speed dating group to sit at, that is the most economical for the restaurant. How many options do I have?

const tableNumbers = [5, 14, 7, 10, 20, 11, 12, 15, 3]

for (let i =0; i < tableNumbers.length; i++) {
  //if the tableNumbers length can be divided by 2 (%) = and leavs a remainder of 0 
    if (tableNumbers[i] % 2 === 0) {
        console.log(tableNumbers[i])
    }
}

Example 4: modulo operator in javascript

// % in JS is the remainder, not modulo
//here is Shanimal's function for modulo operation
// n = your number, m = number to mod by
var mod = function (n, m) {
    var remain = n % m;
    return Math.floor(remain >= 0 ? remain : remain + m);
};
mod(5,22)   // 5
mod(25,22)  // 3
mod(-1,22)  // 21
mod(-2,22)  // 20
mod(0,22)   // 0
mod(-1,22)  // 21
mod(-21,22) // 1

Example 5: javascript modulo

x = a % b // % is modulo

Example 6: mod remainder js

function mod(n, a, b) {
	n = n | 0;
	a = a | 0;
	b = b | 0;
	let rem;
	if (a < 0 || b < 0) {
		const places = (b - a);
		rem = (n - a) % (places + 1);
		rem = rem < 0 ? (rem + (places + 1)) : rem === 0 ? 0 : rem;
		return rem - (places - b);
	}
	if (n === b) return n;
	if (n === b + 1) return a;
	if (n === a - 1) return b;
	rem = n % (b || 1);
	rem = rem < a ? (rem + b) : rem === 0 ? 0 : rem;
	return rem;
}

mod(1, 1, 5); // 1
mod(0, 1, 5); // 5
mod(0, -1, 5); // 0
mod(-2, -1, 5); // 5