AngularJS dependency injection is a software design pattern in which components are given their dependencies rather than hard coding within component i.e. for reusing, maintainable and testable.
value: This is a javaScript object used to pass values to controller during config phase.
factory: This is used to return value after calculation.
service: This is used to perform certain tasks.
provider: This is used to create services, factory etc.
constant: This is used to pass values at config stage as we need to consider that no value will be used to be passed.
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