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Unit 6 · 5 lessons

Arrays

One name for many values: declaring arrays, walking them with loops, the standard algorithms every exam asks for, and two-dimensional grids.

  • 56 practice questions
  • 46 flashcards
  • 3 interactive lessons
Start lesson 1 →Unit 6 test review →

Lessons

  1. 1Declaring and Using ArraysWhy a single name for many values changes what a program can do — and the indexing rules that come with it.11 questions
  2. 2Traversing Arrays and the Standard AlgorithmsThe two ways to walk an array, and the handful of algorithms — sum, average, max, count, search, reverse — that every array question is built from.12 questions
  3. 3Sorting and Binary SearchTwo classic sorts traced pass by pass, why a method can sort the caller's array, and how sorted data lets binary search find anything in a handful of steps.Interactive11 questions
  4. 4Strings as Sequences of CharactersA String is an indexed sequence of characters, so the array skills you already have — indexing, traversal, searching — carry straight over to text, with a handful of String methods doing the heavy lifting.Interactive11 questions
  5. 5Two-Dimensional ArraysRows and columns: declaring a grid, reaching a cell with two indexes, and walking the whole thing with nested loops.Interactive11 questions