You are given two values a and b. Swap them and print the swapped values. Use JavaScript style swap (no third variable)....

You are given variable declarations line by line in a tiny language: 'let x', 'block', 'end'. Count how many times a 'let x' shadows an existing x in an outer scope....

Input has lines like KEY=VALUE. Ignore empty lines and lines starting with #. Print JSON object of key-value pairs (as strings)....