DITOR

A Dependency Injection Detour solution, supplies a convinient way to inject once and use many times.

Installation

npm install -s ditor

Usage

const { Injector } = require('ditor');
var injector = new Injector({ x: 1 });
injector.invoke( ($, {x}) => console.log(x) );

How it works

Ditor injectors allow you to inject dependencies in one place, and use it in many places.

Without Injector

Dependencies must be injected from main to A to B to C in order to use it in C.

With Injector

Dependencies are injected once at the injector creation, then it can be used by C, as well as any other node in the chain.

Branches

You can create branches from an injector, adding more dependencies to it.

Basic Usage

const { Injector } = require('ditor');
var dependency = { x:1 };
var injector = new Injector(dependency);
var consumer = ($, dependency) => console.log(dependency);
injector.invoke(consumer);
// {x:1}

Multi-Dependencies

var a={x:1}, b={y:2};
var injector = new Injector({a,b});
var consumer = ($, {a, b}) => console.log(a, b);
injector.invoke(consumer);
// {x:1} {y:2}

nested-invoke

var a={x:1}, b={y:2};
var injector = new Injector({a,b});
var consumer1 = ($, {a}) => console.log(a);
var consumer2 = ($, {b}) => {
  console.log(b);
  $.invoke(consumer1)
};
injector.invoke(consumer2);
// {y:2}
// {x:1}

Code shorten

var dep1=1, dep2=2, dep3=3, dep4=4, dep5=5, dep6=6;

// without injector
var f1 = (dep1, dep2, dep3, dep4, dep5, dep6) => f2(dep1, dep2, dep3, dep4, dep5, dep6);
var f2 = (dep1, dep2, dep3, dep4, dep5, dep6) => f3(dep1, dep2, dep3, dep4, dep5, dep6);
var f3 = (dep1, dep2, dep3, dep4, dep5, dep6) => f4(dep1, dep2, dep3, dep4, dep5, dep6);
var f4 = (dep1, dep2, dep3, dep4, dep5, dep6) => f5(dep1, dep2, dep3, dep4, dep5, dep6);
var f5 = (dep1, dep2, dep3, dep4, dep5, dep6) => console.log(dep1, dep2, dep3, dep4, dep5, dep6);
f1(dep1, dep2, dep3, dep4, dep5, dep6)
// 1 2 3 4 5 6

// with injector
var f1 = ($) => $.invoke(f2);
var f2 = ($) => $.invoke(f3);
var f3 = ($) => $.invoke(f4);
var f4 = ($) => $.invoke(f5);
var f5 = ($, dep1, dep2, dep3, dep4, dep5, dep6) => console.log(dep1, dep2, dep3, dep4, dep5, dep6);
var injector = new Injector(dep1, dep2, dep3, dep4, dep5, dep6);
injector.invoke(f1);
// 1 2 3 4 5 6

Branches

var a={x:1}, b={y:2}, c={z:3};
var injector = new Injector({ a, b });
var main = ($,{a,b}) => {
  console.log(a,b);
  // c is not accessible here
  var innerInjector = injector.branch(c);
  innerInjector.invoke(inner);
}
var inner = ($, {a,b}, c) => {
  console.log(a,b,c);
}
injector.invoke(main);
// {x:1} {y:2}
// {x:1} {y:2} {z:3}