JS Practice — Built-in Objects

Array.prototype.find() — find in range

📖 Usage Example

const pts = [{x:1,y:1}, {x:2,y:3}, {x:3,y:4}]
pts.find(p => p.x + p.y > 4)  // → {x:2, y:3}

Use find() with a complex predicate to locate an object satisfying multiple conditions.

Array.prototype.find() — compound conditions

find() predicates can be as complex as needed. Multiple conditions can be combined with && to narrow the search.

Challenge: Implement findInRange(nums, lo, hi) that returns the first number between lo and hi (inclusive).

findInRange([1, 5, 3, 8, 6], 4, 7) // → 5
findInRange([1, 2, 3], 10, 20)     // → undefined

💡 Hints (2)

• Combine conditions with `&&`: `n >= lo && n <= hi`.
• Remember: `find` returns the first element that satisfies the condition in array order.