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imperative vs declarative/functional programming

Imperative Programming :

It specifies a series of instructions that the computer executes in sequence. For example, the following function uses imperative approach for finding the square of each element in the given array. [wpgist id="b8190f6b7bfda4fc9ff3" file="imperative.js"]

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Declarative Programming :

It declares a set of rules about what outputs should result from which inputs. For example, the following function uses declarative approach for finding the square of each element in the given array. [wpgist id="b8190f6b7bfda4fc9ff3" file="declarative.js"]

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Functional Programming :

It declares a set of logical functions which define how input is transformed to output. eg. f(y) = y * y. It is a type of declarative language.

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