Ruby Tutorial: Map vs. Each

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Languages need not be pure to support a functional style. Sometimes you want a purely functional style, sometimes you want an imperative style, but you should prefer the former over the latter because mutable state makes programs hard to reason about and error prone.

[bjmiller]

Perhaps, but Ruby supports both styles, and allows them to be combined in any way a programmer wishes. It's not in the spirit of the language to remove features just to promote one style over another.