Imagine three people sitting in a room, lets call them Anna, Brad and Carol.
In object oriented programming, Anna has a paper with cats written on it, and Brad has a paper with are cool written on it. Then Carol comes and asks Brad what do you think?. Brad asks Anna what do you have?, Anna looks at her paper and answers cats. Brad then looks at his paper and answers to Carol Cats are cool.
In functional programming, Carol comes and asks What do you think? then Anna produces a piece of paper, writes cats on it and passes it to Brad. Brad looks at the paper and writes are cool next to cats. Then they hand out the paper to Carol and she reads cats are cool.
It's worth reading the replies I got because we discussed about immutability also, which my original comment doesn't address.
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Imagine three people sitting in a room, lets call them Anna, Brad and Carol.
In object oriented programming, Anna has a paper with cats written on it, and Brad has a paper with are cool written on it. Then Carol comes and asks Brad what do you think?. Brad asks Anna what do you have?, Anna looks at her paper and answers cats. Brad then looks at his paper and answers to Carol Cats are cool.
In functional programming, Carol comes and asks What do you think? then Anna produces a piece of paper, writes cats on it and passes it to Brad. Brad looks at the paper and writes are cool next to cats. Then they hand out the paper to Carol and she reads cats are cool.
It's worth reading the replies I got because we discussed about immutability also, which my original comment doesn't address.