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JS: Implement DI
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| /** | |
| * Constructor DependencyInjector | |
| * @param {Object} - object with dependencies | |
| */ | |
| var DI = function (dependency) { | |
| this.dependency = dependency; | |
| }; | |
| // Should return new function with resolved dependencies | |
| DI.prototype.inject = function (func) { | |
| const deps = func | |
| .toString() | |
| .match(/^function \((.*)\)/)[1] | |
| .split(',') | |
| .map((it) => | |
| this.dependency[it.trim()] | |
| ) | |
| .filter((it) => it !== undefined); | |
| if(deps.length === 0) { | |
| return func; | |
| } | |
| return () => func(...deps); | |
| } | |
| var deps = { | |
| 'dep1': function () {return 'this is dep1';}, | |
| 'dep2': function () {return 'this is dep2';}, | |
| 'dep3': function () {return 'this is dep3';}, | |
| 'dep4': function () {return 'this is dep4';} | |
| }; | |
| var di = new DI(deps); | |
| var myFunc = di.inject(function (dep3, dep1, dep2) { | |
| return [dep1(), dep2(), dep3()].join(' -> '); | |
| }); | |
| Test.assertEquals(myFunc(), 'this is dep1 -> this is dep2 -> this is dep3'); |
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