I'm not sure what this means or how to word the question correctly.
In the first example I could put the variable before the function "numbers1.forEach(...)" but in the second example I could not "num.square()"?
function forEach(array, action) {
for (var i = 0; i < array.length; i++)
action(array[i]);
}
var numbers2 = [1, 2, 3, 4, 5], sum = 0;
forEach(numbers2, function(number) {
sum += number;
});
console.log(sum);
// → 15
var numbers1 = [1, 2, 3, 4, 5], sum = 0;
numbers1.forEach(function(number) {
sum += number;
});
console.log(sum);
// → 15
// this works!
But this does not work
var square = function(x) {
return x * x;
};
var num = 12;
console.log(square(num));
// → 144
console.log(num.square());
// → TypeError: undefined is not a function (line 9)
// does not work?
Thanks!