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mapについて(関数型の高階関数は配列をいい感じに扱うための処理)

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あばろさん(神)に教えていただいたmapについてのメモ

関数型の高階関数は配列をいい感じに扱うための処理

配列に対して
.map -> 配列から別な配列を作る
.reduce -> 配列を1個ずつ順番に処理して配列を作る
.filter -> 配列から条件で絞り込んだ配列を作る
.every -> 全部条件を満たしてたらtrueが返る
.some -> 1個でも条件満たしてたらtrueが返る

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