Variable Types

Variable Types

When you are declaring a new variable, you may optionally declare its type.

JavaScript has three ways of declaring local variables:

• var - declares a variable, optionally assigning a value. (MDN)
• let - declares a block-scoped variable, optionally assigning a value. (MDN)
• const - declares a block-scoped variable, assigning a value that cannot be re-assigned. (MDN)

In Flow these fall into two groups:

• let and var -
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