JS Practice — Built-in Objects

Array.prototype.findIndex() — find string index by length

📖 Usage Example

const words = ['apple', 'banana', 'cherry']
words.findIndex(w => w.startsWith('b'))  // → 1

Use findIndex() to locate the position of a string that matches a pattern.

Array.prototype.findIndex() — strings

You can use findIndex() with strings just as easily as with numbers or objects.

Challenge: Implement indexOfLong(strs, len) that returns the index of the first string with length > len.

indexOfLong(['hi', 'hello', 'world'], 4) // → 1
indexOfLong(['a', 'bb'], 5)              // → -1

💡 Hints (2)