Exercise 9: Extract Numbers from String
Problem Statement
Function `extractNumbers(str)` banao jo string se sabhi numbers extract kare.
Example: extractNumbers("abc123def456") => [123, 456]
Sample Output:
extractNumbers("abc123def456") => [123, 456]
extractNumbers("price: $100") => [100]Solution
const extractNumbers = (str) => {
const matches = String(str ?? "").match(/\d+/g);
return matches ? matches.map(Number) : [];
};Explanation
Overall Goal:
- String se sabhi numbers extract karna.
Real world:
- Data parsing: extract numeric values.
- Text processing: number extraction.