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← Introduction to JavaScript
○What is JavaScript?○Your First JavaScript Code○Data Types○Type Checking
○Declaring Variables○let and const in Practice○Operators○Type Conversion
○Conditionals○Switch Statement○For Loops○While Loop○Break and Continue
○Defining Functions○Arrow Functions○Scope○Closures○Project - Calculator○Function Expressions
○Arrays○Array Mutation Methods○Array Search and Slice○Array Iteration Methods○Multidimensional Arrays○Destructuring○Array Reverse and Sort○Array Fill○Array Find and Includes●Array Flat and FlatMap○Array Reduce, Some, and Every
○Objects○Object Methods and Destructuring○JSON○Math and Date○Date Basics
○02 Template Literals○String Methods○Regular Expressions
○Higher-Order Functions○Callbacks○map, filter, and reduce○Recursion○Project - Data Transform Pipeline
○OOP Introduction○Classes○Inheritance○Encapsulation
○Asynchronous JavaScript○Promises and Async Await○Async API Simulation

Array Flat and FlatMap

Some arrays contain arrays, and sometimes each string needs to turn into multiple pieces. flat() and flatMap() help with those two related problems.

Example

javascript
const nested = [[1, 2], [3, 4]];
const flatNumbers = nested.flat();
const words = ['hello world', 'js'].flatMap((item) => item.split(' '));

Your Task

  1. Create flatNumbers from [[1, 2], [3, 4]] using flat().
  2. Create splitWords with flatMap() and display [1,2,3,4] | ["hello","world","js"] in #output.
Hint 1
1 / 2
HINT 1

Use flat() to collapse one level of nested arrays.

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