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JavaScript: Conditions & Loops

📑 3 slides 👁 2 views 📅 10/18/2026
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Making Decisions in JavaScript

Conditions evaluate Boolean expressions as true or false, allowing a program to choose which code runs.

Making Decisions in JavaScript
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Repeating Work with Loops

  • A for loop combines initialization, a condition, and an update, making it useful when the iteration count is known.
  • A while loop checks its condition before each pass; update the loop variable so the condition eventually becomes false.
  • A do...while loop checks after its body, so its instructions always run at least once.
  • Use break to exit a loop early and continue to skip the current iteration; nested loops handle repeated patterns.
Repeating Work with Loops
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Choose, Repeat, and Practice

  • Combine conditions and loops to solve tasks such as finding the largest of three values or classifying a number.
  • Practice printing even numbers from 1 to 20, then use continue to skip unwanted values during iteration.
  • Compare for, while, and do...while by asking whether the iteration count is known and whether one pass is required.
  • Before running a loop, verify that its condition, update, and any break or continue path produce the intended result.
Choose, Repeat, and Practice
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