Although FP limits the programmer, especially in functional programming languages, there are a number of advantages that increase the demand for this paradigm and code organization style:

Ease of debugging. The immutability of data and the use of pure functions make it easier to detect errors and fix them. When in imperative languages ​​the state of a program can not only complicate finding and fixing an error, but also affect the result of executing the program or the simplest block. Find more out at https://artechyapi.com/why-consider-functional-programming/
Lazy calculations. Functional languages ​​take advantage of lazy evaluation technologies. The compiler itself decides which blocks to execute and which ones to postpone for later, which ones to execute in multitasking mode. This optimizes the execution of the program, influencing the increase in speed.
Dividing the program into modules. Separate blocks of code divide the program into components called modules. This makes it easier to debug and read the code. In this case, separate blocks perform separate operations closed from the external state. Modules can be compared to classes in object-oriented programming, which also divide the program into components that are associated with objects in the physical world.

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