Basic Operators
Mathematic operations to numbers can be performed using some basic operators like:
- Addition operator (
+): The addition operator adds two numbers together. For example:
console.log(1 + 2); // 3
console.log(1 + (-2)); // -1
- Subtraction operator (
-): The subtraction operator subtracts one number from another. For example:
console.log(3 - 2); // 1
console.log(3 - (-2)); // 5
- Multiplication operator (
*): The multiplication operator multiplies two numbers. For example:
console.log(2 * 3); // 6
console.log(2 * (-3)); // -6
- Division operator (
/): The division operator divides one number by another. For example:
console.log(6 / 2); // 3
console.log(6 / (-2)); // -3
- Remainder operator (
%): The remainder operator returns the remainder of a division operation. For example:
console.log(10 % 3); // 1
console.log(11 % 3); // 2
console.log(12 % 3); // 0
The JavaScript interpreter works from left to right. One can use parentheses just like in math to separate and group expressions: c = (a / b) + d
JavaScript uses the + operator for both addition and concatenation. Numbers are added whereas strings are concatenated.
NaN is a reserved word indicating that a number is not a legal number, this arises when we perform arithmetic with a non-numeric string will result in NaN (Not a Number).
let x = 100 / "10";
The parseInt method parses a value as a string and returns the first integer.
parseInt("10"); // 10
parseInt("10.00"); // 10
parseInt("10.33"); // 10
parseInt("34 45 66"); // 34
parseInt(" 60 "); // 60
parseInt("40 years"); //40
parseInt("He was 40"); //NaN
In JavaScript, if we calculate a number outside the largest possible number it returns Infinity .
let x = 2 / 0; // Infinity
let y = -2 / 0; // -Infinity
Exercise
Correct!
let num1 = 10;
let num2 = 5;
// Add num1 and num2.
let addResult =
// Subtract num2 from num1.
let subtractResult =
// Multiply num1 and num2.
let multiplyResult =
// Divide num1 by num2.
let divideResult =
// Find the remainder num1 is divided by num2.
let reminderResult =
let num1 = 10; let num2 = 5; // Add num1 and num2. let addResult = (num1 + num2); // Subtract num2 from num1. let subtractResult = (num1 - num2); // Multiply num1 and num2. let multiplyResult = (num1 * num2); // Divide num1 by num2. let divideResult = (num1 / num2); // Find the remainder num1 is divided by num2. let reminderResult = (num1 % num2);
assert(addResult === 15 && subtractResult === 5 && multiplyResult === 50 && divideResult === 2 && reminderResult === 0 );