JavaScript For Loops

For Loops on API Collections

Instead of counting to 10 with a generic index loop, production code iterates API results — playlist tracks, order line items, GitHub pull requests.

• for...of — iterate playlist tracks
• for...in — object keys (use sparingly)
• Classic for — indexed access when you need i

for (const item of items) {
  const { name, artists, duration_ms } = item.track;
  console.log(`${name} — ${artists[0].name} (${duration_ms}ms)`);
}

// Click Run — watch API traces and console output