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Loops: JavaScript: Uncharted

Courses JavaScriptLoops

Loops

Turn repeated work into clear while and for loops, then control, nest, and accumulate across real routes.

JavaScript
Unit 5 of 20
20 lessons
174 min
420 XP

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Lessons

20 total

1Repeat Yourself? Never.Identify repeated work that is better expressed as one reusable loop.InteractiveConcept7 min20 XPOpen
2While Something HoldsUse a while loop to print a countdown and stop when its condition becomes false.CodeConcept8 min20 XPOpen
3The Loop PayoffReplace ten repeated courier calls with a loop that produces the same route.Code worldConcept9 min20 XPOpen
4Anatomy of forUse the initialization, condition, and update of a for loop to control four laps.CodeConcept8 min20 XPOpen
5Around the BlockUse four loop laps to repeat one forward move and one right turn around a square.Code worldConcept9 min20 XPOpen
6Piling Up a TotalUse an accumulator to add a changing coin deposit on every loop lap.CodeConcept8 min20 XPOpen
7Countdown PrinterControl a descending for loop with a negative step.CodeConcept7 min20 XPOpen
8Streets and StopsUse nested loops to collect parcels across two rows of stops.Code worldConcept11 min20 XPOpen
9break When FoundUse break to stop a search loop at its first matching value.CodeConcept8 min20 XPOpen
10continue to SkipUse continue to skip closed days while keeping the loop moving.CodeConcept8 min20 XPOpen
11How Many Laps?Predict a loop’s iteration count from its start, condition, and update.InteractiveConcept7 min20 XPOpen
12while or for?Choose a natural loop form from what is known about when repetition ends.InteractiveConcept8 min20 XPOpen
13The StaircaseRepeat a four-call loop body to climb a zigzag route.Code worldConcept9 min20 XPOpen
14Banner BuilderGrow a string one repeated symbol at a time inside a loop.CodeConcept8 min20 XPOpen
15Assemble the LoopArrange setup, loop structure, accumulation, and output into a working program.InteractiveConcept8 min20 XPOpen
16Savings GoalUse a while loop to count weekly deposits until savings reach a target.CodePractice9 min20 XPOpen
17Grid SweepUse nested repetition and row turns to deliver across an entire small grid.Code worldPractice12 min20 XPOpen
18Times Table MachineUse nested loops to print every multiplication pair in a 3 by 3 table.CodePractice10 min20 XPOpen
19The Loop That Never EndsIdentify an endless loop by tracing whether its update approaches the exit condition.InteractiveConcept8 min20 XPOpen
20Loops Mastery CheckCombine counted and conditional loops, control statements, and accumulation in one report.CodeMastery check12 min40 XPOpen

Making Decisions Functions