8000 Finish caesar · iamjethrooo/javascript-exercises@22c4a86 · GitHub
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Finish caesar
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lines changed

‎caesar/.DS_Store renamed to ‎DONE/caesar/.DS_Store

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‎caesar/README.md renamed to ‎DONE/caesar/README.md

File renamed without changes.

‎DONE/caesar/caesar.js

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const caesar = function(plaintext, shift) {
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const ALPHABET = [
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"a",
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"b",
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"c",
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"d",
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"e",
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"f",
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"g",
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"h",
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"i",
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"j",
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"k",
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"l",
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"m",
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"n",
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"o",
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"p",
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"q",
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"r",
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"s",
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"t",
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"u",
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"v",
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"w",
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"x",
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"y",
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"z",
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];
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// Convert plaintext to array of characters to compare them to alphabet array
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let temp = plaintext.split('');
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plaintext = temp;
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let ciphertext = "";
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if (shift < 0) {
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shift = ALPHABET.length - Math.abs(shift);
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}
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// Removes unnecesssary wrap cycles
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while (shift > 26) {
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shift -= 26;
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}
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for (let i = 0; i < plaintext.length; i++) {
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let c = plaintext[i];
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let needsWrap = (ALPHABET.indexOf(c.toLowerCase()) + shift + 1) > ALPHABET.length;
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let isNotLetter = c.toLowerCase() == c.toUpperCase() || c.trim() == "";
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let isLowercase = ALPHABET.indexOf(c) != -1;
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// If character is not a letter, just add to ciphertext
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if (isNotLetter) {
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ciphertext += c;
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continue;
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}
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// If character is lowercase
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if (isLowercase) {
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if (needsWrap) {
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ciphertext += ALPHABET[ALPHABET.indexOf(c) + shift - ALPHABET.length];
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continue;
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}
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ciphertext += ALPHABET[ALPHABET.indexOf(c) + shift];
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continue;
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}
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// If character is uppercase
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else {
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c = c.toLowerCase();
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if (needsWrap) {
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ciphertext += ALPHABET[ALPHABET.indexOf(c) + shift - ALPHABET.length].toUpperCase();
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continue;
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}
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ciphertext += ALPHABET[ALPHABET.indexOf(c.toLowerCase()) + shift].toUpperCase();
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continue;
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}
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}
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return ciphertext;
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}
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module.exports = caesar

‎caesar/caesar.spec.js renamed to ‎DONE/caesar/caesar.spec.js

Lines changed: 6 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -4,22 +4,22 @@ describe('caesar', function() {
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it('works with single letters', function() {
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expect(caesar('A', 1)).toEqual('B');
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});
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xit('works with words', function() {
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it('works with words', function() {
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expect(caesar('Aaa', 1)).toEqual('Bbb');
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});
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xit('works with phrases', function() {
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it('works with phrases', function() {
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expect(caesar('Hello, World!', 5)).toEqual('Mjqqt, Btwqi!');
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});
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xit('works with negative shift', function() {
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it('works with negative shift', function() {
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expect(caesar('Mjqqt, Btwqi!', -5)).toEqual('Hello, World!');
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});
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xit('wraps', function() {
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it('wraps', function() {
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expect(caesar('Z', 1)).toEqual('A');
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});
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xit('works with large shift factors', function() {
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it('works with large shift factors', function() {
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expect(caesar('Hello, World!', 75)).toEqual('Ebiil, Tloia!');
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});
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xit('works with large negative shift factors', function() {
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it('works with large negative shift factors', function() {
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expect(caesar('Hello, World!', -29)).toEqual('Ebiil, Tloia!');
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});
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});

‎caesar/caesar.js

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