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Questions and Answers
What is the primary function of conditional statements in JavaScript?
What is the primary function of conditional statements in JavaScript?
What is the purpose of the break keyword in a switch statement?
What is the purpose of the break keyword in a switch statement?
What is the advantage of using functions in JavaScript?
What is the advantage of using functions in JavaScript?
What is an anonymous function in JavaScript?
What is an anonymous function in JavaScript?
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What is the purpose of a default case in a switch statement?
What is the purpose of a default case in a switch statement?
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What are the two main categories of data types in JavaScript?
What are the two main categories of data types in JavaScript?
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What is the purpose of the assignment operator (=) in JavaScript?
What is the purpose of the assignment operator (=) in JavaScript?
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What is the term for the notation used in arrow functions?
What is the term for the notation used in arrow functions?
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What are the three parts of an arrow function?
What are the three parts of an arrow function?
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In what version of JavaScript were arrow functions introduced?
In what version of JavaScript were arrow functions introduced?
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Study Notes
Data Types in JavaScript
- JavaScript has two types of data types: Primitive and Non-primitive (Reference) data types.
Operators in JavaScript
- There are several types of operators in JavaScript:
- Arithmetic Operators: used to perform arithmetic operations on operands
- Comparison (Relational) Operators: compare two operands
- Bitwise Operators: perform bitwise operations on operands
- Logical Operators: determine the logic between variables or values
- Assignment Operators: assign a value to a variable
- Special Operators: (?:) &, etc.
Arrow Functions
- Arrow functions were introduced in ES6 and allow for shorter function syntax
- An arrow function consists of three parts:
- Parameters: optional function parameters
- Fat arrow notation/lambda notation: the notation for the arrow (=>)
- Statements: the instruction set of the function
Conditional Statements
- Conditional statements are used to decide the flow of execution based on different conditions
- There are several types of conditional statements in JavaScript:
- if: specifies a block of code to be executed if a specified condition is true
- else: specifies a block of code to be executed if the same condition is false
- else if: specifies a new condition to test if the first condition is false
- switch: specifies many alternative blocks of code to be executed
Loops in JavaScript
- Loops are used to iterate a piece of code using for, while, do while, or for-in loops
- JavaScript supports different kinds of loops:
- for: loops through a block of code a number of times
- for/in: loops through the properties of an object
- for/of: loops through the values of an iterable object
- while: loops through a block of code while a specified condition is true
- do/while: also loops through a block of code while a specified condition is true
Functions in JavaScript
- A JavaScript function is a block of code designed to perform a particular task
- JavaScript functions are used to perform operations and have several advantages:
- Code reusability: can be called multiple times
- Less coding: makes the program more compact
Types of Functions in JavaScript
- There are two main types of functions in JavaScript:
- Named Functions (Function Declarations): a function with a name that can be used as a callback
- Anonymous Functions (Function Expressions): a function without a name, often used as a one-time callback
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Description
Learn about JavaScript data types, including primitive and non-primitive types, and understand how to use various operators such as arithmetic, assignment, and more.
