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Function Declaration

Function Declaration is creating a named function

function foo() {
    return "Hello";
}

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Function Expression

A Function Expression defines a function as a part of a larger expression syntax. Functions defined via Functions Expressions can be named or anonymous.

//anonymous function expression

var foo = function() {
    return "foo";
}

//named function expression

var bar = function bar() {
    return "bar";
}

//named function expression using arrow functions

var baz = () => {
    return "baz"
}