How to change char value in array to int value? and detect first element and second element in array
arr = [a,a,a,b,b,a,b]
first element = a
second element = b
a = 1, b = 2
My expected output
arr = [1,1,1,2,2,1,2]
>Solution :
You can do it like so.
You can only get the char code of an index in a string. Since we have an char array we can alsways get the index of 0.
The smallest charcode is of A which is 65. In this example I transform a to A which resolves to 65 then I remove 64 since a should be 1. Consecutively b is mapped to B which is 65 and resolves to 2 since 64 is removed
const arr = ['a','a','a','b','b','a','b']
const res = arr.map(char => char.toUpperCase().charCodeAt(0) - 64)
console.log(res)