JS Built-ins
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Variablesintermediate

Variables — let in loop closures (per-iteration binding)

let in loops: each iteration gets a fresh binding

When you use let in a for loop, JavaScript creates a new binding for each iteration. Closures created inside the loop each capture their own copy of i.

Challenge: Write letLoopClosure() that:

  1. Creates an array fns
  2. Uses a for (let i = 0; i < 3; i++) loop and pushes () => i to fns
  3. Returns fns[0]() — this returns 0 (the iteration-specific binding)
💡 Hints (1)
  • • let creates a new scope per iteration — each closure captures its own i