Javascript Mathematical Operations

Mathematical Operators in JavaScript

1. Addition

• Operator: +
• Description: Adds two numbers together.
• Example:

  let a = 5;
  let b = 3;
  let result = a + b; // result is 8
  

2. Subtraction

• Operator: -
• Description: Subtracts the second number from the first.
• Example:

  let a = 5;
  let b = 3;
  let result = a - b; // result is 2
  

3. Multiplication

• Operator: *
• Description: Multiplies two numbers.
• Example:

  let a = 5;
  let b = 3;
  let result = a * b; // result is 15
  

4. Division

• Operator: /
• Description: Divides the first number by the second.
• Example:

  let a = 15;
  let b = 3;
  let result = a / b; // result is 5
  

5. Modulus (Remainder)

• Operator: %
• Description: Returns the remainder after division of one number by another.
• Example:

  let a = 10;
  let b = 3;
  let result = a % b; // result is 1
  

6. Exponentiation

• Operator: **
• Description: Raises the first number to the power of the second.
• Example:

  let a = 2;
  let b = 3;
  let result = a ** b; // result is 8
  

7. Increment

• Operator: ++
• Description: Increases a variable by 1.
• Example:

  let a = 5;
  a++; // a is now 6
  

8. Decrement

• Operator: --
• Description: Decreases a variable by 1.
• Example:

  let a = 5;
  a--; // a is now 4
  

9. Unary Negation

• Operator: -
• Description: Converts a positive number to negative, and vice versa.
• Example:

  let a = 5;
  let result = -a; // result is -5
  

10. Unary Plus

• Operator: +
• Description: Attempts to convert the operand to a number.
• Example:

  let a = "5";
  let result = +a; // result is 5 as a number
  

11. Assignment with Operators

• Addition Assignment: +=

  let a = 5;
  a += 3; // a is now 8
  

• Subtraction Assignment: -=

  let a = 5;
  a -= 3; // a is now 2
  

• Multiplication Assignment: *=

  let a = 5;
  a *= 3; // a is now 15
  

• Division Assignment: /=

  let a = 15;
  a /= 3; // a is now 5
  

• Modulus Assignment: %=

  let a = 10;
  a %= 3; // a is now 1
  

• Exponentiation Assignment: **=

  let a = 2;
  a **= 3; // a is now 8
  

Example: Incrementing and Decrementing by More Than 1

You can increment or decrement a variable by more than 1 using the += and -= operators.

Instructions:

• Use += to increment a variable by a specific number.
• Use -= to decrement a variable by a specific number.

  JavaScript Example:

  ```javascript let count = 10; // Increment by 5 count += 5; console.log(“After incrementing by 5:”, count); // Output: 15 // Decrement by 3 count -= 3; console.log(“After decrementing by 3:”, count); // Output: 12

Popcorn Hack One

Change the number below and change one mathematical opperation to your liking.

%%js

// JavaScript Hack: Even or Odd Transformation with Notebook Display

let origNum = 14; // Original number
let num = origNum; // Change this number to test different values

// Check if number is even or odd, and then transform
num % 2 === 0 
  ? (num -= 7) // If even, divide by 2
  : (num **= 2); // If odd, square it

// Display initial and final result in Jupyter Notebook cell
element.append("Original number: " + origNum);
element.append("<br>");
element.append("Transformed number: " + num);

<IPython.core.display.Javascript object>