JavaScript Why return function in a function?

Question

var favoriteColor = \"blue\";
function colorGenerator(color) {
    return function () { return color; };
}
var getColor = colorGenerator(favoriteColor);

Answer 1

most time we return funciton, our target is limit variable scope and keep state. so your code should be:

function colorGenerator(color) {
    var favoriteColor = color; //here keep state
  return function (c) { return c===favoriteColor; };
}
var isorange = colorGenerator("orange"); //because you only call colorGenerator one time, so function isorange keep the state : 'orange'
isorange('black') //here return false
isorange('orange') //here return true