wren/doc/site/core/io.markdown

^title IO Class ^category core

The IO class can be used to read and write to and from the console.

Static Methods

IO.print(objects...)

Prints a series of objects to the console followed by a newline. Each object is converted to a string by calling toString on it. This is overloaded to support up to 16 objects. To pass more, use printAll().

IO.print("I like bananas") I like bananas IO.print("Oranges", 10) Oranges10

IO.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.

IO.printAll([1, [2, 3], 4]) 1[2, 3]4

IO.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.

IO.write(4 + 5) 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.

IO.read()

Reads in a line of text from stdin. Note that the returned text includes the trailing newline.

var name = IO.read() John IO.print("Hello " + name + "!") Hello John !

IO.read(prompt)

Displays prompt then reads in a line of text from stdin. Note that the returned text includes the trailing newline.

var name = IO.read("Enter your name: ") Enter your name: John IO.print("Hello " + name + "!") Hello John !