JS Practice — Built-in Objects

String.prototype.search() — -1 when not found

📖 Usage Example

'hello world'.search(/world/)   // → 6
'hello'.search(/d/)           // → -1
'abc123'.search(/[0-9]/)       // → 3

Use search() to find the index of the first regex match in a string, returning -1 if not found.

String.prototype.search() — Not Found

When the regex has no match, .search() returns -1.

Challenge: Implement hasUpperCase(str) that returns true if the string contains an uppercase letter.

hasUpperCase('Hello') // → true
hasUpperCase('hello') // → false

💡 Hints (1)