JS: Functions

Included in the course

What you'll learn

• Use advanced function capabilities to write concise and efficient code
• Separate pure functions from those with side effects
• Use higher-order functions (map/filter/reduce) to handle collections
• Recognize the imperative and declarative (functional) paradigms

Description

JavaScript functions go much beyond what you already know! You will learn about first-class objects, lambda functions, and higher-order functions in this course. Learn how to do the "mapping", "filtering", and "aggregation" operations, as well as how to pass and take an infinite number of arguments. Learn about external libraries that make programming much simpler.

Course program

• 1

  About course

  Learn about the course, its structure, objectives, and goals

  theory
• 2

  Pure functions

  Learn about the concepts of determinism and side effects

  theory

  quiz

  exercise
• 3

  Command–query separation

  Meet the CQS principle

  theory

  quiz
• 4

  Rest parameter syntax (packing arguments)

  Learn how to use the rest syntax to form an array from function arguments

  theory

  quiz

  exercise
• 5

  Spread syntax (unpacking arguments)

  Learn how to use the spread syntax with a function call

  theory

  quiz

  exercise
• 6

  Parameter destructuring

  Learn how to apply the destructuring assignment for function parameters

  theory
• 7

  First-class objects

  Consider functions as data. Learn about arrow functions

  theory

  quiz

  exercise
• 8

  Higher-order functions

  Learn how to build abstractions using functions

  theory

  quiz

  exercise
• 9

  Mapping

  Learn how to use the map method

  theory

  quiz

  exercise
• 10

  Filtering

  Learn how to use the filter method

  theory

  quiz

  exercise
• 11

  Reducing

  Learn how to use the reduce method

  theory

  quiz

  exercise
• 12

  Signals

  Come to grips with the concept of standard interface

  theory

  quiz

  exercise
• 13

  Programming paradigms

  Become familiar with the "paradigm" concept and examine the differences between imperative and declarative paradigms

  theory

  quiz
• 14

  Building abstraction using functions

  Summarize knowledge about functions and get to grips with the concept of abstraction

  theory
• 15

  Additional resources

  Some materials the Hexlet team have picked up. This will give you a more in-depth understanding of the topic

Challenges

We recommend working on these challenges after completing the course. They'll help you obtain more experience in programming and strengthen your new skills.