Question

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JavaScript: var functionName = function() {} vs function functionName() {}
What is the difference between these 2 function syntax types

In JavaScript, we can define a function, which will be called at a later time, using one of the methods below. That is, using a named function and assigning an anonymous function to a variable.

function myAdd(a, b) {
    console.log(a + b);
}
myAdd(3, 2);

var mySubtract = function (a, b) {
    console.log(a - b);
}
mySubtract(3, 2);

Are they basically always identical? By identical, I mean no special contexts that might make them different. For example, it turns out multiple left-hand assignment has some subtleties that might lead to a different result depending on the context.

Answer 1

The function declaration is hoisted (and can be used everywhere in the scope), the function expression will be available only after the assignment.