20. JavaScript functions. Functions Expression vs Function Declaration.

Опубликовано: 05 Май 2020
на канале: Travels Code

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Let’s formulate the key differences between Function Declarations and Functions Expressions.

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First, the syntax: how to differentiate between them in the code.
The more subtle difference is when a function is created by the JavaScript engine.

A Function Expression is created when the execution reaches it and is usable only from that moment.
A Function Declaration can be called earlier than it is defined.

In strict mode, when a Function Declaration is within a code block, it’s visible everywhere inside that block. But not outside of it.

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