Understanding S.O.L.I.D Principles

SOLID is an acronym based upon 5 design principles which was introduced by Robert C. Martin in order to make software designs more understandable, easier to maintain and easier to extend.

A blender consists of toggle buttons to basically quicken the blending process . Each time it directly affects the primary goal of the blender, to emulsify food. emulsifying food ingredients is the only thing it does, it will not make you coffee too!

One class should serve only one purpose. i.e all methods and properties of a class should all work towards the same goal.

A holiday package offers a variety of services together such as travel arrangements, stay, food etc. Open for extension means the travel company could add additional items to your package. For example they could throw in a complimentary vehicle for your holiday, however they cannot remove the main services offered to you.

Software entities (classes, functions, etc) should be extendable without actually changing the contents of the class that’s been extended.

Taxi apps offers their service based on options starting from a mini to a luxury sedan. The company must send a car that fits your requirements. The requirement of the most basic option is to get you a car that takes you from point A to B. Any car, whether standard, VIP fulfills that requirement. i.e other options inherit and extend from the standard option.

Instead of throwing all kinds of garbage away without any kind of segregation, waste can be separated into different dustbins based on different categories of waste such as wet and dry which should be disposed separately.

Simply, this rule states that we should break our interfaces into smaller ones, so they satisfy the exact needs of the client .

A computer consists of several ports for each external device, I cannot attach a keyboard to a printer port and vice versa. The same problems occurs with other devices as well. Therefore its like a tight coupling, where I cannot change the external device on the given interface. However, using a USB port any device could be easily attached to the machine to perform the required task.

There should not be tight coupling among software components and to avoid such coupling, the components should depend on abstractions i.e a contract (interface / abstract class).

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