es6-const-let Flashcards

1
Q

What is a code block? What are some examples of a code block?

A

A block of statement within curly braces { };

Examples: if else, for, do while, while; function code block;

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2
Q

What does block scope mean?

A

An area within the block where variables can be referenced

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3
Q

What is the scope of a variable declared with const or let?

A
Let = block-scoped;
Const = block-scoped
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4
Q

What is the difference between let and const?

A

Const can’t be reassigned while let can.

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5
Q

Why is it possible to .push() a new value into a const variable that points to an Array?

A

The value within the array is mutable

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6
Q

How should you decide on which type of declaration to use?

A

If the variable is not going to be reassigned, use ‘const’. If it will be reassigned, then use ‘let’

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