JavaScript Operators

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JavaScript Operators

JavaScript operators are used to perform operations on JavaScript variables or directly on data.

What are the 4 types of JavaScript operators?

There are four types of JavaScript operators: arithmetic operators, comparison operators, logical operators, and string concatenation operators.

What are the most common JavaScript operators?

The most common JavaScript operators include addition (+), subtraction (-), multiplication (*), division (/), equality (==), strict equality (===), less than (<), greater than (>), less than or equal to (<=), greater than or equal to (>=), logical AND (&&), logical OR (||), and logical NOT (!).

JavaScript Example: Operators

// JavaScript operators examples
var num1 = 10;
var num2 = 5;
var sum = num1 + num2; // addition
var difference = num1 - num2; // subtraction
var product = num1 * num2; // multiplication
var quotient = num1 / num2; // division
var isEqual = num1 === num2; // strict equality
var isLessThan = num1 < num2; // less than
var logicalAND = (num1 > 0) && (num2 > 0); // logical AND
var concatString = "Hello, " + "Software Testing Space Viewer!"; // string concatenation
// Output results using document.write()
document.write("Sum: " + sum + '<br />');
document.write("Difference: " + difference + '<br />');
document.write("Product: " + product + '<br />');
document.write("Quotient: " + quotient + '<br />');
document.write("Is Equal: " + isEqual + '<br />');
document.write("Is Less Than: " + isLessThan + '<br />');
document.write("Logical AND: " + logicalAND + '<br />');
document.write("Concatenated String: " + concatString);

FAQ (Interview Questions and Answers)

1. What are the four types of JavaScript operators?
   Arithmetic, comparison, logical, and string concatenation
   Unary, binary, ternary, and assignment
   Primary, secondary, conditional, and assignment
   
2. Which operator is used for string concatenation in JavaScript?
   &&
   ==
   +
   
3. What does the logical AND operator (&&) do in JavaScript?
   Performs a logical AND operation on two conditions
   Performs a logical OR operation on two conditions
   Negates a condition
   
4. What is the result of the expression 5 > 3?
   true
   false
   undefined
   
5. Which operator is used for strict equality comparison in JavaScript?
   =
   ===
   ==
   

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