What do factory, service and dependency injection exactly mean in angular.js

Question

I am a little confused about the following Angular.js concepts:

factory
service
dependency injection

Can anyone brief me on each one with a simple example or explanation? Any help would be appreciated.

hope helps: http://stackoverflow.com/questions/15666048/service-vs-provider-vs-factory, http://stackoverflow.com/questions/13762228/confused-about-service-vs-factory/13763886#13763886 — Marian Ban, Sep 20 '14 at 17:17

Paul Sweatte · Answer 1 · 2017-07-06T18:42:08.367

These concepts are part of JavaScript core.

RegExp is a Factory:

console.log(RegExp("[0-9]") );
console.log(RegExp("[a-z]") );
console.log(RegExp("[A-Z]") );
console.log(RegExp("[0-9a-zA-Z]") );

Math is a Service:

console.log(Math.PI);
console.log(Math.round(Math.PI));
console.log(Number(Math.random() * 1000).toFixed());
console.log(Number(Math.random() * 10).toPrecision(2));
console.log(Math.floor(Math.random() * 20) + 1);

call and apply are Dependency Injection:

"use strict";

var foo = {
    min: function min(array) {
        return Math.min.apply(Math, array);
    },

    max: function max(array) {
        return Math.max.apply(Math, array);
    }
};

var bar = foo.min([1,2,3]);
var baz = foo.max([1,2,3]);

console.log("bar: " + bar);
console.log("baz: " + baz);

References

What do factory, service and dependency injection exactly mean in angular.js

1 Answers1