Lazy Evaluation

Lazy evaluation is a programming technique where the evaluation of an expression is delayed until its value is actually needed. In other words, the computation is not performed until the result is required. This technique is used to improve the efficiency of programs by avoiding unnecessary computations. Lazy evaluation is commonly used in functional programming languages, where it is often referred to as call-by-need. Lazy evaluation can also be used in object-oriented programming languages, where it is often used to implement iterators and generators. Lazy evaluation can be contrasted with eager evaluation, where expressions are evaluated as soon as they are encountered. While eager evaluation can be simpler to reason about, lazy evaluation can lead to more efficient and concise code.
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