Is Function Declaration Hoisted in JavaScript?

In JavaScript, before the code is executed, the interpreter moves/hoists function declarations/statements to the top of their scope (which is either an enclosing function or the global scope). This means that you can call the function before it is declared. For example:

hoisted(); // 'foo'

function hoisted() {
    console.log('foo');
}

This can lead to confusion, erroneous code and sometimes unexpected results:

function hoisted() {
    console.log('foo');
}

hoisted(); // 'bar'

function hoisted() {
    console.log('bar');
}

To prevent functions from being used before they are declared, you can instead use function expressions.