Can you explain the differences between map, filter, reduce, and loops in JavaScript?
Sure! In JavaScript, map
, filter
, and reduce
are higher-order functions that operate on arrays, while loops are control structures for iteration.
What does each of these methods do specifically?
map
creates a new array by applying a function to each element, filter
creates a new array with elements that pass a test, and reduce
accumulates a single value from an array.
When should I use one over the others?
Use map
when you want to transform data, filter
when you need to select specific elements, and reduce
when you want to compute a single result from an array.
Can you give me an example of each?
Absolutely! For map
, you might double each number in an array. For filter
, you could select only even numbers. For reduce
, you could sum all numbers in an array.
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