Your first program

Yu runs in your browser: open yu-lang.vercel.app and start writing. There is nothing to install.

The editor is on the left of the Studio; that is where the program goes. On the right there are two tabs: Picture shows what the program drew, Terminal shows what it said in words. The Run button at the top right starts the program, and so does Ctrl+Enter.

Say something

The shortest program in Yu is one word, say, and some text in brackets:

say("Hello, world!")

Hello, world!

Part by part. say is a command: write this in the terminal. The brackets hold what to say. The quotes mean that what is inside is text, not the name of something. Press Run and the Studio opens Terminal with your line.

More than one line

A program runs from top to bottom, line by line. A line that starts with # is not run: it is a comment, a note for a person.

# Yu does not run this line
say("My name is Yurii")
say("I am 15 years old")

My name is Yurii
I am 15 years old

Yu can count

The brackets can hold arithmetic as well as text. Separate several values with commas: Yu prints them on one line with a space between them.

say("2 + 2 =", 2 + 2)

2 + 2 = 4

Text in quotes is printed as it is, and arithmetic without quotes is worked out. That is why "2 + 2 =" stayed a label and 2 + 2 became 4.

Try it yourself

1. Write a program that prints two lines about you: your name and where you live.

say("My name is Olya")
say("I live in Kyiv")

2. Let Yu work out 7 × 8 and print the result with a label.

say("7 × 8 =", 7 * 8)

7 × 8 = 56