Boooyaaa

function dictionary(arr) {
    let definitions = arr[0].split(" | ");
    let definitionsToPrint = arr[1].split(" | ").sort((a, b) => a.localeCompare(b));
    let lastCommand = arr[2];

    let dictionary = {};

    definitions.forEach(element => {
        dictionary = dictionaryPopulation(dictionary, element);
        for (let word in dictionary) {
            dictionary[word].sort((a, b) => b.length - a.length || a.localeCompare(b));
        };
    });

    definitionsToPrint.forEach(definition => {
        if (dictionary[definition] !== undefined) {
            console.log(`${definition}\n -${dictionary[definition].join(`\n -`)}`);

        }
    })

    if (lastCommand === "End") return;
    if (lastCommand === "List") console.log(Object.keys(dictionary).sort((a, b) => a.localeCompare(b)).join(" "));

    function dictionaryPopulation(obj, input) {
        let [word, definition] = input.split(": ");
        if (obj[word] === undefined) {
            obj[word] = [];
        }
        obj[word].push(definition);
        return obj;
    }
}