52 lines
2.0 KiB
JavaScript
52 lines
2.0 KiB
JavaScript
function caesar(word, shift) {
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//let alphabet = ["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"];
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let alphabet = [["A","a"],["B","b"],["C","c"],["D","d"],["E","e"],["F","f"],["G","g"],["H","h"],["I","i"],["J","j"],["K","k"],["L","l"],["M","m"],["N","n"],["O","o"],["P","p"],["Q","q"],["R","r"],["S","s"],["T","t"],["U","u"],["V","v"],["W","w"],["X","x"],["Y","y"],["Z","z"]];
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let cypher = [["A","a"],["B","b"],["C","c"],["D","d"],["E","e"],["F","f"],["G","g"],["H","h"],["I","i"],["J","j"],["K","k"],["L","l"],["M","m"],["N","n"],["O","o"],["P","p"],["Q","q"],["R","r"],["S","s"],["T","t"],["U","u"],["V","v"],["W","w"],["X","x"],["Y","y"],["Z","z"]];
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// declare an array for the secret word
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let newWord = [];
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if (shift > 0) {
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//if positive number, shift and push
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for (i = 0; i < shift; i++) {
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//cypher.unshift(cypher.pop());
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cypher.push(cypher.shift());
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}
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} else {
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//if negative number, turns to positive, pop and unshift
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for (i = 0; i < Math.abs(shift); i++) {
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cypher.unshift(cypher.pop());
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//cypher.push(cypher.shift());
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}
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}
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console.log("alphabet : " + alphabet);
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console.log("cypherla : " + cypher);
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// read each character from word one by one
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for (j = 0; j < word.length; j++) {
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let char1 = word.charAt(j);
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console.log(char1);
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for (k = 0; k < alphabet.length; k++) {
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//let char2 = alphabet[k];
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if (char1 === alphabet[k][0]) { // if in capital letter
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newWord.push(cypher[k][0]);
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break;
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} else if (char1 === alphabet[k][1]) { // if in small letter
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newWord.push(cypher[k][1]);
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break;
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} else if (char1 === ',' || char1 === ' ' | char1 === '!') { // maintain comma, space and exclamation
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newWord.push(char1);
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break;
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}
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}
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}
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console.log(newWord);
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let lastWord = newWord.join(""); //join array elements to a string without any separator ""
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console.log(lastWord);
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// console.log(lastWord.replace(/,/g, ""));
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}
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caesar("Hello, world!", 5); |