Tell us what’s happening:
While working through this module, I created an unusual solution using regular expressions. Though this solution passed (yay!) it is very different from the provided solutions. Please note, I didn’t crosscheck hints or the solution until after my solution had passed so I’m curious how my solution is vastly different.
I have two questions:
I know people don’t like regex because its difficult to read, but is there any other reason I shouldn’t use it in this module.
What is the argument to use another method for this solution (as opposed to mine)
Your code so far
//Return true if the string in the first element of the array contains all of the letters of the string in the second element of the array. Think scrabble
function mutation(arr) {
let base = arr[0];
let regex = RegExp('^[' + base + ']+$', 'i');
return regex.test(arr[1]);
}
console.log(mutation(["Mary", "Army"])); //true
/*RegExp:
RegExp constructor creates a regular expression object for matching text with a pattern
Constructor parameters are enclosed between quote marks '' or "", instead of literal notation that is typically seen with regex /regex/
Constructor is used because the pattern is from the user input, arr[1] aka base variable
+base+ concatenated base variable with constructor ''
Reading the regex:
^ start of string
$ end of string
^string$ means no other characters other than the pattern
base is the variable container value "Army"
[...] One of the characters in the brackets for that specific character space
+ one or more of the previous.
flag i: upper or lower case
RegExp('^[' + base + ']+$', 'i')
Equivalent to: /^[Army]+$/i
*/
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Challenge: Mutations
Link to the challenge: