How can I filter an array to retain only the initial 5 characters of every element?

I need help using the .map function to transform this array so that only the first 5 characters are displayed, like "01:00", "02:00"?

This is the array:

["01:00:00 AM", "02:00:00 AM", "03:00:00 AM", "04:00:00 AM", "05:00:00 AM", "06:00:00 AM", "07:00:00 AM", "08:00:00 AM", "09:00:00 AM", "10:00:00 AM", "11:00:00 AM", "12:00:00 PM", "13:00:00 PM", "14:00:00 PM", "15:00:00 PM", "16:00:00 PM", "17:00:00 PM", "18:00:00 PM", "19:00:00 PM", "20:00:00 PM", "21:00:00 PM", "22:00:00 PM", "23:00:00 PM", "00:00:00 AM"]
javascript

Answer №1

To start off, create a custom function that extracts the first 5 characters of any given string:

function extractFirstFive(str){return str.substring(0, 5)}

Next, utilize this function with the array.map method:

arr = ["Hello World", "Good Morning", "Bonjour"]  
arr.map(extractFirstFive) //=> ["Hello", "Good ", "Bonjo"]

When referring to the official documentation for array.map, it's mentioned that this function (similar to others in JavaScript) accepts another function as an argument.

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