Skip to content

Update caesar.js #6

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Update caesar.js #6

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
18 changes: 18 additions & 0 deletions tasks/5. Caesar cipher/caesar.js
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,3 +1,21 @@
export function encryptCaesar(inputString, key) {
// TODO: write your code here
const legend = 'abcdefghijklmnopqrstuvwxyz'.split('');
const map = getMap(legend, key);
return inputString
.toLowerCase()
.split('')
.map(char => map[char] || char)
.join('');
}
const getMap = (legend, shift) => {
return legend.reduce((charsMap, currentChar, charIndex) => {
const copy = { ...charsMap };
let ind = (charIndex + shift) % legend.length;
if (ind < 0) {
ind += legend.length;
};
copy[currentChar] = legend[ind];
return copy;
}, {});
};