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Scope

Blocks and Scope

Before we talk more about scope, we first need to talk about blocks.

We've seen blocks used before in functions and if statements. A block is the code found inside a set of curly braces {}. Blocks help us group one or more statements together and serve as an important structural marker for our code.

A block of code could be a function, like this:

const logSkyColor = () => { let color = 'blue'; console.log(color); // blue };

Notice that the function body is actually a block of code.

Observe the block in an if statement:

if (dusk) { let color = 'pink'; console.log(color); // pink };

In the next few exercises, we'll see how blocks define the scope of variables.

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