## Problem You are given the following JavaScript snippets. For each one, state what it prints and explain why. **Snippet A:** ```js for (var i = 0; i console.log(i), 0); } ``` **Snippet B:** ```js for (let i = 0; i console.log(i), 0); } ``` **Snippet C:** ```js function makeAdder(x) { return function(y) { return x + y; }; } const add5 = makeAdder(5); console.log(add5(3)); console.log(add5(10)); ``` **Expected Output:** ``` Snippet A: 3 3 3 Snippet B: 0 1 2 Snippet C: 8 15 ``` Now write a function `once(fn)` that returns a wrapper that calls `fn` at most one time. Subsequent calls return the result of the first call. ## Follow-ups 1. How does `var` scoping differ from `let` in loop bodies? 2. Implement `memoize(fn)` using a closure. 3. What is the difference between `.call`, `.apply`, and `.bind`? 4. How would you debounce a function using closures?

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Problem You are given the following JavaScript snippets. For each one, state what it prints and explain why. Snippet A: Snippet B: Snippet C: Expected Output: Now write a function once(fn) that returns a wrapper that calls fn at most one time. Subsequent calls return the result of the first call. Follow-ups How does var scoping differ from let in loop bodies? Implement memoize(fn) using a closure. What is the difference between .call, .apply, and .bind? How would you debounce a function using cl…

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JavaScript Functions and Closures - Frontend Phone Screen

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