函数声明与函数声明有什么区别？ JavaScript 中的定义？

Question

There are examples here with C++ and Java but it'll be great if someone can explain this with JavaScript examples. Also how is definition Vs. declaration works for variables.

Answer 1

There is no notion of " function definitions " in JavaScript. It does only distinguish between function declarations and function expressions (and the deprecated function statements ).

When we use the term "definition", it's typically meant as a hyperonym for both.

It's similar for variables: there's only the term variable declaration in the standard, and when we use "variable definition" we either refer to that or the initialisation of the variable with a value (or both).