plonk.pro

Appearance

If Statement ​

if statements follow C syntax.

rust
if foo(x) {
    print("It's true!");
} else if bar == baz {
    print("It's true again!");
} else if baz.is_foo() {
    print("Yet again true.");
} else if foo(bar - baz) {
    print("True again... this is getting boring.");
} else {
    print("It's finally false!");
}
if foo(x) {
    print("It's true!");
} else if bar == baz {
    print("It's true again!");
} else if baz.is_foo() {
    print("Yet again true.");
} else if foo(bar - baz) {
    print("True again... this is getting boring.");
} else {
    print("It's finally false!");
}

While Loop ​

while loops follow C syntax.

continue can be used to skip to the next iteration, by-passing all following statements; break can be used to break out of the loop unconditionally.

rust
let x = 10;

while x > 0 {
    x -= 1;
    if x < 6 { continue; }  // skip to the next iteration
    print(x);
    if x == 5 { break; }    // break out of while loop
}
let x = 10;

while x > 0 {
    x -= 1;
    if x < 6 { continue; }  // skip to the next iteration
    print(x);
    if x == 5 { break; }    // break out of while loop
}

For Loop ​

Iterating through a numeric range or an array, or any iterable type, is provided by the for … in loop.

There are two alternative syntaxes, one including a counter variable:

for variable in expression { … }

for ( variable , counter ) in expression { … }

Break or Continue ​

continue can be used to skip to the next iteration, by-passing all following statements; break can be used to break out of the loop unconditionally.

For Expression ​

for statements can also be used as expressions.

The break statement takes an optional expression that provides the return value.

The default return value of a for expression is ().

js
let a = [42, 123, 999, 0, true, "hello", "world!", 987.6543];

// 'for' can be used just like an expression
let index = for (item, count) in a {
    // if the 'for' loop breaks here, return a specific value
    switch item.type_of() {
        "i64" if item.is_even => break count,
        "f64" if item.to_int().is_even => break count,
    }

    // ... if the 'for' loop exits here, the return value is ()
};

if index == () {
    print("Magic number not found!");
} else {
    print(`Magic number found at index ${index}!`);
}
let a = [42, 123, 999, 0, true, "hello", "world!", 987.6543];

// 'for' can be used just like an expression
let index = for (item, count) in a {
    // if the 'for' loop breaks here, return a specific value
    switch item.type_of() {
        "i64" if item.is_even => break count,
        "f64" if item.to_int().is_even => break count,
    }

    // ... if the 'for' loop exits here, the return value is ()
};

if index == () {
    print("Magic number not found!");
} else {
    print(`Magic number found at index ${index}!`);
}