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What are operators in JavaScript?

Educative Answers Team

In JavaScript (and programming in general), operators are used to assign or compare values, perform arithmetic operations, evaluate expressions, and more.

JavaScript supports the following operators:

Arithmetic Operators

Arithmetic operators use numeric values as their operands and return a single numerical value.

Comparison Operators

A comparison operator is a binary operator that takes two operands and compares their values.

//arithmetic operators
console.log(2+2);
console.log(8*3);
console.log(17%3);
//comparison operators
console.log(2==2);
console.log(2>9);
console.log(6>=6);
console.log(7<=5);

Logical (or Relational) Operators

A logical operator is used to determine the logic between two expressions. It takes in two operands and produces a single logical value. It returns a Boolean value if used with Boolean operands and vice versa.

For example, the && operator evaluates in the following way:

Operand 1 Operand 2 Result
True True True
True False False
False True True
False False False

Assignment Operators

An assignment operator is the operator used to provide a new value to the left operand according to the value of the right operand.

Conditional (or Ternary) Operators

Conditional operators are used in evaluating a condition and return a value based on the evaluation of the condition. It is usually used as a shortcut to the if condition.

       condition ? exp1 : exp2 

It takes three operands and returns the value of exp1 if the condition is true and the value of exp2 if the condition is false.

// logical operators
console.log(true&&true);
console.log((2==2)&&false);
console.log((2<12)&& (9>=9));
//assignment operators
var a=5*5;
var b=2!=2;
console.log(a);
console.log(b);
a*=2; //multiplying a by 2 and assigning the result to a
console.log(a);
//conditional(ternary operator)
var c=(5<2)? "5 is less than 2":"5 is not less than 2.";
console.log(c);

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