Accessing a method in the same factory - angularjs

Question

I have a factory defined like this:
mob.factory("OrderHelper", function() {
return {
lineItemPrice: function(lineItem) {
return lineItem.price * lineItem.quantity;
},
orderTotal: function(order) {
order.items.forEach(function (item)) {
total += lineItemPrice(item);
}
}
}
});
That problem is that I can't use the method "lineItemPrice" in "orderTotal" method.
It throws this error: Error: [$interpolate:interr] Can't interpolate: £{{orderTotal(order)}}
Can somebody please tell how can I call a method from a function in the same factory.
Thanks.

Answer 1

you could also do it like this:
mob.factory("OrderHelper", function() {
var methods = {};
methods.lineItemPrice = function(lineItem) {
return lineItem.price * lineItem.quantity;
};
methods.orderTotal = function(order) {
order.items.forEach(function (item)) {
total += methods.lineItemPrice(item);
}
};
return methods;
});

Answer 2

Try this (the revealing module pattern):
mob.factory("OrderHelper", function() {
var lineItemPrice = function(lineItem) {
return lineItem.price * lineItem.quantity;
};
var orderTotal = function(order) {
order.items.forEach(function (item)) {
total += lineItemPrice(item);
}
};
return {
lineItemPrice: lineItemPrice,
orderTotal: orderTotal
}
});

Answer 3

You can use angular.foreach() to iterate each items and supply the third parameter as the context of the callback function.
mob.factory("OrderHelper", function() {
return {
lineItemPrice: function(lineItem) {
return lineItem.price * lineItem.quantity;
},
orderTotal: function(order) {
var total = 0;
angular.forEach(order.items, function(item) {
total += this.lineItemPrice(item)
}, this); // add `this` as the context of the callback
return total;
}
}
});