Lazy evaluation is a fundamental concept in Haskell that sets it apart from other programming languages. It refers to the evaluation strategy where expressions are not evaluated until their values are actually needed. This means that Haskell postpones the evaluation of expressions as long as possible, deferring the computation until the value is required to produce an output.
In Haskell, data structures and computations are represented as expressions rather than as immediate values. When an expression is defined, it is not immediately evaluated. Instead, it is stored as a thunk, which is a promise to compute the value when needed. The actual evaluation happens only when the value is demanded, typically by an operation or function that depends on it.
This approach offers several significant benefits in Haskell:
1. Efficiency: Lazy evaluation allows for more efficient program execution by avoiding unnecessary computations. Haskell evaluates expressions only when their values are required to produce the final result. This avoids unnecessary calculations and saves computational resources. It also enables working with potentially infinite data struc....
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