Your playground has three lines of code now. You can ignore the first two for now, but focus on the third line where you can see the declaration of a variable.
A variable is like a storage where you keep some values. This storage is called a variable because its content can vary which means that you can reuse or change it. You’re probably familiar with the word variability.
A variable is a way of saving a value (a piece of information) with a specific name. By naming a value, we can later recall and reuse that value again in our code. We can also easily change that value throughout our code.
With variables we can start using a very important programming concept: repetition. This means that instead of writing out the same piece of information every time we need it, we store it in a variable, our computer remembers it and can repeat it back.
Our code creates such a variable:
This new variable is called str and its value is “Hello, playground”.
Now, click the tiny arrow below the code to execute it:
On the right of the playground you’ll see “Hello, playground” in the output area. This is how you know that the value has been set for our variable:
And because the str is a variable we can change it:
str="Have a nice day"
Notice that this time, we don’t use the var keyword. That because the str has already been created and we are just changing its value now: