Introduction to JavaScript

Arithmetic Operators

Basic arithmetic often comes in handy when programming.

An operator is a character that performs a task in our code. JavaScript has several built-in in arithmetic operators, that allow us to perform mathematical calculations on numbers. These include the following operators and their corresponding symbols:

  1. Add: +
  2. Subtract: -
  3. Multiply: *
  4. Divide: /
  5. Remainder: %

The first four work how you might guess:

console.log(3 + 4); // Prints 7 console.log(5 - 1); // Prints 4 console.log(4 * 2); // Prints 8 console.log(9 / 3); // Prints 3

Note that when we console.log() the computer will evaluate the expression inside the parentheses and print that result to the console. If we wanted to print the characters 3 + 4, we would wrap them in quotes and print them as a string.

The remainder operator, sometimes called modulo, returns the number that remains after the right-hand number divides into the left-hand number as many times as it evenly can: 11 % 3 equals 2 because 3 fits into 11 three times, leaving 2 as the remainder.

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