58e4d26648
Get rid of the separate opt-in IO class and replace it with a core System class. - Remove wren_io.c, wren_io.h, and io.wren. - Remove the flags that disable it. - Remove the overloads for print() with different arity. (It was an experiment, but I don't think it's that useful.) - Remove IO.read(). That will reappear using libuv in the CLI at some point. - Remove IO.time. Doesn't seem to have been used. - Update all of the tests, docs, etc. I'm sorry for all the breakage this causes, but I think "System" is a better name for this class (it makes it natural to add things like "System.gc()") and frees up "IO" for referring to the CLI's IO module.
1.3 KiB
^title System Class ^category core
The System class is a grab-bag of functionality exposed by the VM, mostly for use during development or debugging.
Static Methods
System.print()
Prints a single newline to the console.
System.print(object)
Prints [object] to the console followed by a newline. If not already a string,
the object is converted to a string by calling toString on it.
:::dart
System.print("I like bananas") // Prints "I like bananas".
System.printAll(sequence)
Iterates over [sequence] and prints each element, then prints a single newline
at the end. Each element is converted to a string by calling toString on it.
:::dart
System.printAll([1, [2, 3], 4]) // Prints "1[2, 3]4".
System.write(object)
Prints a single value to the console, but does not print a newline character
afterwards. Converts the value to a string by calling toString on it.
:::dart
System.write(4 + 5) // Prints "9".
In the above example, the result of 4 + 5 is printed, and then the prompt is
printed on the same line because no newline character was printed afterwards.
System.clock
Returns the number of seconds (including fractional seconds) since the program was started. This is usually used for benchmarking.