Loops

Loops are made to execute the same piece of code multiple times in a row. Here is a list of available loops in Nougaro:

Nougaro	Python	C/C++
for	for	for
while	while	while
do ... then loop while	(nothing)	do ... while

for

The for loop can have two usages: browse every element in a list (or a str), or iterate a certain number of times.

for each

To browse every element in a list (or a str), use the following syntax:

# One line
for identifier in list then ...

# Multiple lines
for identifier in list then
   ...
   ...
end

For each element of the list, the variable identifier will be set to the corresponding element, and this variable can be used inside the loop.

for i = ... to ...

# One line
for identifier = start_value to end_value then ...
for identifier = start_value to end_value step step_value then ...

# Multiple lines
for identifier = start_value to end_value then
    ...
    ...
end

for identifier = start_value to end_value step step_value then
    ...
    ...
end

start_value, end_value and step_value are integers. If step_value is not specified, the default value is 0.

This loop starts by setting the variable identifier to start_value, then executes the loop. It then adds step_value to identifier. If the value of identifier is greater than or equal to end_value, the loops stops without executing. Otherwise, it runs until this condition is reached.

while

The while loop is used to repeat a piece of code as long as a condition is met. It has the following syntax:

# One line
while condition then ...

# Multiple lines
while condition then
    ...
    ...
end

do

The do loop is used to execute a piece of code a first time, then repeat it as long as a condition is met. It has the following syntax:

# One line
do ... then loop while condition

# Multiple lines
do
    ...
    ...
then loop while condition

Labels

You can label a loop using for:label, while:label or do:label. Labels are identifiers. You can use labels with break and continue.

break, continue

• The break statement completely stops the loop. If there is a returned list, the value is not added to this list. You can use break and return ... to return a specific value.
• The continue statement omit the code after it, and execute another time the loop like if the last time was ended.
• continue and break work normally at the first execution of a do body.
• continue:label will continue the loop that has this label. If you’re in an :inner loop inside a :label loop, the :inner loop will break and the :label loop will continue.
• break:label will break the loop that has this label. If you’re in an :inner loop inside a :label loop, the :inner AND the :label loop will break.