Merc is a simple interpreter for a dynamically-typed programming language. It supports basic programming constructs such as variables, functions, conditionals, loops, and arithmetic operations. The interpreter is written in Rust and provides a REPL (Read-Eval-Print Loop) for interactive programming.

• Variables: Define and manipulate variables using the let keyword.
• Functions: Define and call functions using the func keyword.
• Conditionals: Use if and else for conditional logic.
• Loops: Implement loops using the while keyword.
• Arithmetic: Perform basic arithmetic operations like addition, subtraction, multiplication, and division.
• String Concatenation: Concatenate strings using the + operator.
• Boolean Operations: Perform boolean operations like && (AND) and || (OR).
• REPL: Interactive REPL for running code snippets.

Here is an example script that you can run with the interpreter:

let x = 10;
let y = 20;

func add(a, b) {
    return a + b;
}

let result = add(x, y);

if result > 30 {
    print("Result is greater than 30");
} else {
    print("Result is less than or equal to 30");
}

while x > 0 {
    print(x);
    x = x - 1;
}

• help: Show a list of available commands and language features.
• clear: Clear the screen and reset the REPL.
• exit: Exit the REPL.
• env: Show all defined variables in the current environment.

let x = 10;
let y = "Hello, world!";

func add(a, b) {
    return a + b;
}

if x > 10 {
    print("x is greater than 10");
} else {
    print("x is less than or equal to 10");
}

while x > 0 {
    print(x);
    x = x - 1;
}

let sum = 1 + 2 * 3;
let difference = 10 - 5;
let product = 4 * 5;
let quotient = 20 / 4;

let greeting = "Hello, " + "world!";

let is_true = true && false;
let is_false = true || false;