JS Practice — Built-in Objects

Array.prototype.some() — check for negatives

📖 Usage Example

const nums = [1, 3, 5, 8]
nums.some(n => n % 2 === 0)  // → true  (8 is even)

Use some() to check whether at least one element satisfies a condition.

Array.prototype.some()

Array.prototype.some(predicate) returns true if at least one element satisfies the predicate, false otherwise. It short-circuits as soon as a match is found.

Challenge: Implement hasNegative(nums) that returns true if any number in the array is less than 0.

hasNegative([1, -2, 3])  // → true
hasNegative([1, 2, 3])   // → false

💡 Hints (2)

• `some(n => n < 0)` checks every element until it finds one less than zero.
• `some()` on an empty array always returns `false` — there are no elements to match.