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Arrays

2 lessonsAbout 12 minutesBeginner

This part of the DSA Tutorial runs from Arrays in JavaScript for DSA through to Array Traversal Patterns. There are 2 lessons here, and working through them takes about 12 minutes at a steady pace.

It follows on from Big O and Complexity, so finish that first if you have not already — the examples below assume you are comfortable with it.

Each lesson below says what it covers before you open it. Read them in order the first time; afterwards this page works as a index you can jump back into when you need to check one thing.

  1. 1Arrays in JavaScript for DSAWhat a JavaScript array really is, why push is fast and shift is slow, and the true cost of every array operation you will use in algorithm problems.
  2. 2Array Traversal PatternsThe four ways to walk an array in algorithm problems — running state, both ends, read and write pointers, and remembering what you have seen — with JavaScript examples.
All of DSA TutorialNext: Strings