Reference error in step 6 of message mixer

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1

Hi
I get this error message at point 6 of message mixer:

$ node message-mixer.js caesar 4
/home/ccuser/workspace/modules-message-mixer/encryptors.js:3
caesarCipher,
^

ReferenceError: caesarCipher is not defined
at Object. (/home/ccuser/workspace/modules-message-mixer/encryptors.js:3:3)
at Module._compile (module.js:571:32)
at Object.Module._extensions…js (module.js:580:10)
at Module.load (module.js:488:32)
at tryModuleLoad (module.js:447:12)
at Function.Module._load (module.js:439:3)
at Module.require (module.js:498:17)
at require (internal/module.js:20:19)
at Object. (/home/ccuser/workspace/modules-message-mixer/message-mixer.js:2:20)
at Module._compile (module.js:571:32)

This is what is in "encryptor.js:

// Declare and export the functions here.
module.exports= {
caesarCipher,
symbolCipher,
reverseCipher
};
//module.exports.caesarCipher = caesarCipher;

const caesarCipher = (str, amount = 0) => {
if (amount < 0) {
return caesarCipher(str, amount + 26);
}
let output = ‘’;
for (let i = 0; i < str.length; i++) {
let char = str[i];
if (char.match(/[a-z]/i)) {
let code = str.charCodeAt(i);
if (code >= 65 && code <= 90) {
char = String.fromCharCode(((code - 65 + amount) % 26) + 65);
} else if (code >= 97 && code <= 122) {
char = String.fromCharCode(((code - 97 + amount) % 26) + 97);
}
}
output += char;
}
return output;
};

const symbolCipher = (str) => {
const symbols = {
‘i’: ‘!’,
‘!’: ‘i’,
‘l’: ‘1’,
‘1’: ‘l’,
‘s’: ‘$’,
‘$’: ‘s’,
‘o’: ‘0’,
‘0’: ‘o’,
‘a’: ‘@’,
‘@’: ‘a’,
‘e’: ‘3’,
‘3’: ‘e’,
‘b’: ‘6’,
‘6’: ‘b’
}

let output = ‘’;
for (let i = 0; i < str.length; i++) {
let char = str.toLowerCase()[i];

if (symbols[char]) {
  output += symbols[char]
} else {
  output += char;
}

}
return output;
}

const reverseCipher = (sentence) => {
let words = sentence.split(’ ‘);
for (let i = 0; i < words.length; i++) {
words[i] = words[i].split(’‘).reverse().join(’‘);
}
return words.join(’ ');
};
and this is what is in message-mixer.js:

// Import the functions from encryptors.js here.
const encryptors = require(‘./encryptors.js’)
const {caesarCipher, symbolCipher, reverseCipher} = encryptors;
const encryptionMethod = getEncryptionMethod();
process.stdin.on(‘data’, (userInput) => {
displayEncryptedMessage(encryptionMethod, userInput);
});

/* Helper function for determining which cipher method
the user chose when they ran the program. */
function getEncryptionMethod() {
let encryptionMethod;

const encryptionType = process.argv[2];
if (encryptionType === ‘symbol’) {
encryptionMethod = symbolCipher;
} else if (encryptionType === ‘reverse’) {
encryptionMethod = reverseCipher;
} else if (encryptionType === ‘caesar’) {
let amount = Number(process.argv[3]);
if (Number.isNaN(amount)) {
process.stdout.write(Try again with a valid amount argument. \n)
process.exit();
}
encryptionMethod = (str) => caesarCipher(str, amount);
}
else {
process.stdout.write(Try again with a valid encryption type. \n)
process.exit();
}

process.stdout.write('Enter the message you would like to encrypt…\n> ');
return encryptionMethod;
}

/* Helper function for displaying the encrypted message to the user. */
function displayEncryptedMessage(encryptionMethod, userInput) {
let str = userInput.toString().trim();
let output = encryptionMethod(str);
process.stdout.write(\nHere is your encrypted message:\n> ${output}\n)
process.exit();
}
I’d appreciate any help!

i

2

Move your export statement to the bottom of encryptors.js - I think because it’s running the code synchronously (in order, line by line) it is exporting it before they have been declared within the file.

// Declare and export the functions here.
module.exports = {
  caesarCipher,
  symbolCipher,
  reverseCipher,
};

Let us know if it works!

1 Like
3

It worked!

Thanks for your help

2 Likes