Skip to main content

Courses About Pricing Educators

Sign in Get started

Courses About Pricing Educators

Get started Sign in

Loading courses

Loading lessons

Arrays: JavaScript: Uncharted

Courses JavaScriptArrays

Arrays

Create ordered collections, update their contents, traverse them with loops, and search or copy useful ranges.

JavaScript
Unit 7 of 20
20 lessons
180 min
420 XP

Every lesson is open. Sign in when you are ready to begin.

Sign in to start

Lessons

20 total

1Lists Run Your LifeRecognize ordered daily-life collections and connect their positions to zero-based indexes.InteractiveConcept7 min20 XPOpen
2Your First ArrayCreate an array, retrieve its first item by index, and print that value.CodeConcept8 min20 XPOpen
3length and the LastUse array length and last-index arithmetic to retrieve the final item safely.CodeConcept7 min20 XPOpen
4push and popAdd and remove values at the end of an array with push and pop.CodeConcept8 min20 XPOpen
5Front of the LineUse unshift and shift to add and remove values at the beginning of an array.CodeConcept8 min20 XPOpen
6Change in PlaceReplace one array item by assigning a new value at its index.CodeConcept7 min20 XPOpen
7The Courier Reads a ListLoop over a starter array and translate each move name into a courier method call.Code worldConcept11 min20 XPOpen
8for...of ComfortUse a for-of loop to visit every array value without managing an index.CodeConcept8 min20 XPOpen
9Predict the ArrayTrace four array mutations and predict the final ordered values.InteractiveConcept8 min20 XPOpen
10Build As You GoConstruct a new array by pushing one computed value during each loop iteration.CodeConcept8 min20 XPOpen
11Is It in There?Use includes and indexOf to check membership and locate an array value.CodeConcept8 min20 XPOpen
12Slice of the ActionCopy a range with slice and verify that changing the copy leaves the original untouched.CodeConcept9 min20 XPOpen
13Parcels with AddressesLoop over address data and branch on each item’s side field to drive a route.Code worldConcept11 min20 XPOpen
14Reverse by HandWrite a loop that returns a reversed copy without using Array.prototype.reverse.CodeConcept10 min20 XPOpen
15Shopping List ManagerBuild functions that add, remove, and report shopping-list items.CodePractice11 min20 XPOpen
16Join the ParadeJoin array values into one correctly punctuated announcement.CodeConcept7 min20 XPOpen
17Week of WeatherCompute the minimum, maximum, and average of an array using loops.CodePractice11 min20 XPOpen
18Multi-Stop MondayCompose a longer courier route by looping over an array of stop instructions.Code worldPractice12 min20 XPOpen
19Why Zero-Based?Explain how zero-based indexes create the common off-by-one trap.InteractiveConcept9 min20 XPOpen
20Arrays Mastery CheckCombine copying, indexing, mutation, loops, and searching in one route-planning function.CodeMastery check12 min40 XPOpen

Functions Objects