What are some examples of lazy evaluation in programming?
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What are some examples of lazy evaluation in programming?
Lazy evaluation is a programming technique where expressions are not evaluated until their values are needed. A common example is in functional programming languages like Haskell.
Can you give me a specific example in Haskell?
Sure! In Haskell, you can define an infinite list of Fibonacci numbers. The list is generated lazily, so you can compute only as many Fibonacci numbers as you need.
How does this improve performance?
It improves performance by avoiding unnecessary calculations. If you only need the first few Fibonacci numbers, the rest won't be computed, saving time and resources.
Are there other languages that support lazy evaluation?
Yes, languages like Python, JavaScript, and Scala also support lazy evaluation through generators or similar constructs.
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