"ruby check if variable is array"

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1. ruby check if variable exists ••• /mo •••
2. ruby check if element is in array ••• /mo •••
3. ruby check type of variable ••• /mo •••
4. matlab check if variable is array ••• /mo •••
5. check if value is in array ••• /mo •••
6. know if a variable is an array ••• /mo •••
7. javascript check if variable is array ••• /mo •••
8. check if variable is numpy array ••• /mo •••
9. ruby contains in array ••• /mo •••
10. ruby check if string is empty ••• /mo •••
11. how to use array in ruby ••• /mo •••
12. java check if value is in array ••• /mo •••

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