Use the .map Method To Iterate And To Return Modified Object

Developers have to understand the difference between .map and .each methods. When using these functions try to choose the appropriate method based on the situations.
For example, If you want to return the vowels array in the capital letter then use .map method,

Don’ts

vowels = [‘a’, ‘e’, ‘i’, ‘o’, ‘u’] new_vowels = [] vowels = vowels.each { |vowel| new_vowels << vowel.upcase } puts new_vowels -> [‘A’, ‘E’, ‘I’, ‘O’, ‘U’]

Do’s

vowels = [‘a’, ‘e’, ‘i’, ‘o’, ‘u’] new_vowels = vowels.map { |vowel| vowel.upcase } puts new_vowels -> [‘A’, ‘E’, ‘I’, ‘O’, ‘U’]

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