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Operators JS

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Devashish Jadhav
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Table of contents

Arithmetic operators

These operators are used to do mathematical calculations:

  • Addition operator (+)

      let x = 4;
  let y = 5;

  console.log(x + y);

  • Subtraction operator (-)

      let x = 4;
  let y = 5;

  console.log(x - y);

  • Multiplication operator (*)

      let x = 4;
  let y = 5;

  console.log(x * y);

  • Division operator (/)

      let x = 4;
  let y = 5;

  console.log(x / y);

  • Modulus operator (%)

      let x = 4;
  let y = 5;

  console.log(x % y);

  • Exponentiation operator (**)

      let x = 4;
  let y = 5;

  console.log(x ** y);

Assignment operators

These operators are used to assign values to variables. They include:

  • Assignment operator (=)

      let x = 5;

  • Addition assignment operator (+=)

      let x = 4;
  x += 5;  // x = x + 5

  • Subtraction assignment operator (-=)

      let x = 14;
  x -= 5; // x = x - 5

  • Multiplication assignment operator (*=)

      let x = 14;
  x *= 5;  // x = x * 5

  • Division assignment operator (/=)

      let x = 15;
  x /= 5;  // x = x / 5

  • Modulus assignment operator (%=)

      let x = 15;
  x %= 5;  // x = x % 5

Comparison operators

These operators are used to compare values. They include:

  • Equal to operator (==)

      5 == 5 // true
  5 == '5' // true
  'hello' == 'Hello' // false
  // This operator compares two values for equality, and returns true if they are equal, and false otherwise.

  • Not equal to operator (!=)

      5 != 3 // true
  5 != 5 // false
  'hello' != 'Hello' // true
  // returns true if they are not equal, and false otherwise

  • Strict equal to operator (===)

      5 === 5 // true
  5 === '5' // false
  // This operator compares two values for strict equality and returns true if they are both of the same type and have the same value, and false otherwise.

  • Strict not equal to operator (!==)

      5 !== 3 // true
  5 !== 5 // false
  'hello' !== 'Hello' // true
  // returns true if they are either not of the same type or not the same value, and false otherwise.

  • Greater than operator (>)

      5 > 3 // true
  5 > 10 // false

  • Less than operator (<)

      5 < 10 // true
  5 < 3 // false

  • Greater than or equal to operator (>=)

      5 >= 5 // true
  5 >= 10 // false

  • Less than or equal to operator (<=)

      5 <= 10 // true
  5 <= 3 // false

Logical operators

These operators are used to combine or negate boolean values. They include:

  • Logical AND operator (&&)

      let x = 5;
  let y = 10;
  if (x > 0 && y > 0) {
    console.log("Both x and y are positive.");
  }
  // Output: "Both x and y are positive."

  • Logical OR operator (||)

      let x = 5;
  let y = 10;
  if (x > 0 || y > 0) {
    console.log("At least one of x and y is positive.");
  }
  // Output: "At least one of x and y is positive."

  • Logical NOT operator (!)

      let x = 5;
  let y = 10;
  if (!(x > y)) {
    console.log("x is not greater than y.");
  }
  // Output: "x is not greater than y."
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