Operators
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Expert Answer & Key Takeaways
Mastering Operators is essential for high-fidelity technical architecture and senior engineering roles in 2026.
JavaScript Operators
JavaScript operators are used to perform different types of mathematical and logical computations. They are the tools that allow you to manipulate data and control execution flow.
1. Types of JavaScript Operators
JavaScript includes several types of operators, specialized for different tasks:
| Operator Type | Examples |
|---|---|
| Arithmetic | +, -, *, /, **, %, ++, -- |
| Assignment | =, +=, -=, *=, /= |
| Comparison | ==, ===, !=, !==, >, <, >=, <= |
| Logical | &&, ` |
| Ternary | ? : |
| Type | typeof, instanceof |
2. Assignment Operator (=)
The assignment operator assigns a value to a variable.
let x = 10; // Assigns 10 to x3. Adding Operator (+)
The addition operator adds numbers.
let x = 5;
let y = 2;
let z = x + y; // z is 74. Multiplying Operator (*)
The multiplication operator multiplies numbers.
let x = 5;
let y = 2;
let z = x * y; // z is 105. String Operators
The
+ operator can also be used to add (concatenate) strings.let text1 = "John";
let text2 = "Doe";
let text3 = text1 + " " + text2; // "John Doe"The
+= assignment operator can also be used to add (concatenate) strings:let text1 = "What a very ";
text1 += "nice day"; // "What a very nice day"[!IMPORTANT] When used on strings, the+operator is called the concatenation operator.
6. Logical Operators
Logical operators are used to determine the logic between variables or values:
| Operator | Description |
|---|---|
&& | Logical and (returns true only if both sides are true) |
| ` | |
! | Logical not (reverses the boolean value) |
Top Interview Questions
?Interview Question
Q:What is the difference between = and ==?
A:
= is an assignment operator used to give a value to a variable. == is a comparison operator used to check if two values are equal.
?Interview Question
Q:How do you add strings together in JavaScript?
A:
You can use the + operator (concatenation) or the += operator to add text strings together.
?Interview Question
Q:Which operator is used to check if both conditions are true?
A:
The Logical AND operator (&&) returns true only if both expressions or values on either side evaluate to true.
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