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elloWorld.js
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elloWorld.js
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// Usage: $ node HelloRube/Javascript/elloWorld.js Hello World
let input = "";
process.argv.forEach((val, index, array) => {
if ([0, 1].indexOf(index) === -1) {
if (index !== 2) {
val = ` ${val}`;
}
input += val;
}
});
const ALPHABET = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ ".split(
""
);
const transformTextCharacterToAlphabetIndex = array => {
return new Promise((resolve, reject) => {
const indexArray = array.map(character => {
const index = ALPHABET.indexOf(character);
if (index !== -1) {
return index;
}
});
resolve(indexArray);
});
};
const transformAlphabetIndexToCharacterArray = array => {
return new Promise((resolve, reject) => {
const characterArray = array.map(index => {
return ALPHABET[index];
});
resolve(characterArray);
});
};
const convertToArray = text => {
return new Promise((resolve, reject) => {
resolve(text.split(""));
});
};
const convertToString = text => {
return new Promise((resolve, reject) => {
resolve(text.join(""));
});
};
class HelloWorld {
constructor(text) {
this.text = text;
}
async transform(initialText) {
let promises = [
convertToArray,
transformTextCharacterToAlphabetIndex,
transformAlphabetIndexToCharacterArray,
convertToString
];
let lastResult = initialText;
for (let i = 0; i < promises.length; i++) {
lastResult = await promises[i](lastResult);
}
return lastResult;
}
say() {
if (this.text === "" || this.text === undefined) {
console.log("You forgot to enter some text...");
return;
}
this.transform(this.text)
.then(text => console.log(text))
.catch(error => console.log(error));
}
}
new HelloWorld(input).say();