Javascript operators examples

Learn how to use operators in javscript, Assignment operator, Comparison operator, Logical operator, Bitwise operator, Arithmetic operator in Javascript.

Assignment operators are used when we want to assign some value to a variable.

At the time of assignment, we can use the current value and then increment or decrement the assigned value.

• =
  assigning the right side value to variable in left side
  a = b, means assigning the value of b to a
• +=
  current value + new value
  var a = 10; a += 5;
  that means a will become a+5= 15
• -=
  current value - new value
  var a = 10; a -= 5;
  that means a will become a-5= 5
• *=
  current value * new value
  var a = 10; a *= 5;
  that means a will become a*5= 50
• /=
  current value / new value
  var a = 10; a /= 5;
  that means a will become a/5= 2

Comparison operators in javascript are used when we want to compare two variable, if they are equal, not equal, greater and equal, less than equal etc.

• ==
  equal to, check if both equal, Returns true or false
  a==b, means a equal to b
• !=
  Not equal to, check if both not equal, Returns true or false
  a!=b, means a not equal to b
• >
  greater than, Returns true or false
  a>b, means a greater than b
• >=
  greater than equal to, Returns true or false
  a>=b, means a greater than equal to b
• <
  less than, Returns true or false
  a<b, means a less than b
• <=
  less than equal to, Returns true or false
  a<b, means a less than equal to b
• ===
  When we want to compare both conditions, equal value and equal type, we use === operator.

  let a=10;b=10;
  if(a===b)
      console.log("true");
   else 
      console.log("false");
  

Logical operators are basically when we want to apply logic to the line of code using some operator, are called logical operators, there are only three!

• ||
  OR operator
  (a === 10 || b === 5) is false
• &&
  AND operator
  (a < 10 && b >5) is true
• !
  NOT operator
  !(a == b) is true

• ~
  NOT
  a = ~ 5

  console.log(~3); // -4
  console.log(~5); // -6
  console.log(~8); // -9
  

• ^
  XOR
  XOR ^ : Sets each bit to 1 if only one of two bits is 1 a = 5 ^ 1

  console.log(3^2); // 1
  console.log(2^2); // 0
  console.log(3^3); // 0
  console.log(10^5); // 15
  console.log(10^2); // 8
  console.log(5^1); // 4
  

Here we use two variable (a=10, b=5) to show you the examples below.

• %
  Modulus (division remainder) operator

  let a = 10; b = 5;
  r1 = eval(a % b);
  console.log(r1);
  

  result zero
• ++
  Increment operator

  var a = 10; b = 5;
  
   r1 = a+a;
   console.log(r1); // 20
  
   a++;
   r2 = a; // 11
   console.log(r2);
  

• --
  Decrement operator example

  var a = 10; b = 5;
  r1 = a-a;
  console.log(r1); // 0
  
  a--;
  r2 = a; // 9
  console.log(r2);
  

• +
  Addition operator

  let a = 10; b = 5;
  r1 = eval(a + b);
  console.log(r1);
  

• -
  Subtraction operator

  let a = 10; b = 5;
  r1 = eval(a - b);
  console.log(r1);
  

  result 5
• *
  Multiplication operator

  let a = 10; b = 5;
  r1 = eval(a * b);
  console.log(r1);
  

  result 50
• /
  Division operator

  let a = 10; b = 5;
  r1 = eval(a / b);
  console.log(r1);
  

  result 2