Function becomes undefined when declaring local variable with same name

Question

I have declared a function in file so that it becomes global:

Answer 1

It's because of javascript's hoisting

function() {
        var speakService = speakService();
        return speakService;
    }

Will be same as

function() {
        var speakService; //Declaration moved to top
        speakService = speakService(); //here speakService is undefined
        return speakService;
    }