Control structures

If conditional

In melon the if statement is similar to most imperative programming languages, its syntax is:

if (expression) <statement>

The statement is usually a block or a function call/assignment statement:

if (1 < 2) {

// do stuff

io.print("Ok");

}

if (1 < 2) io.print("Ok");

else/else if also work as usual:

if (a < 2) {

io.print("Ok");

} else if (a < 5) {

io.print("Maybe Ok");

} else {

io.print("Not Ok");

}

While loop

While loops execute a statement while an expression is true, in melon they follow the syntax convention of most imperative languages:

while(someExpression) <statement>

As in the if conditional, the statement is usually a block or a function call/assignment statement:

while (someExpression) {

// do stuff

io.print("Ok");

}

while (someExpression) io.print("Ok");

For-in loops

The for loop in melon is bit different from the one in most imperative languages and it's more like a for-each loop. The for loop in melon iterates over a an Iterator value, assigning each element to a variable in succession.

For example you can use a for loop to iterate over Range values:

for (let i in 0..10) {

io.print(i);

}

The code above will print numbers from 0 to 9, the for loop will get the iterator from the 0..10 range value and put the next value in the i variable. On the next step of the loop, i will contain the next value in the iterator, i will change on every iteration until the iterator returns a value with its done property set to true. See Iterator for an in-depth explanation.