tseamAccount за луди

tseamAccount = (input) => {

    const indexOf = (array, element) => {
        const len = array.length;
        for(let i = 0; i < len; i++) {
            if(array[i] === element) {
                return i;
            }
        }
        return -1;
    };

    const removeAt = (array, index) => {
        let len = array.length;
        if(index < 0 || index > len - 1) return undefined;
        const element = array[index];

        for(let i = index; i < len; i++) {
            array[i] = array[i+1];
        }
        array.length = len - 1;

        return element;
    };

    const addAt = (array, index, item) => {
        const len = array.length;
        if(index < 0 || index > len) {
            return;
        }
        if(index === len) {
            array[len] = item;
            return;
        }

        for(let i = len; i > index; i--) {
            array[i] = array[i-1];
        }
        array[index] = item;
    };

    const printArray = (array, separator) => {
        let output = '';
        const len = array.length;
        for(let i = 0; i < len; i++) {
            output += `${array[i]}${separator}`;
        }
        console.log(output);
    };

    const substring = (string, startIndex, count) => {
        let substring = '';
        const len = count ? count + startIndex : string.length;
        for(let i = startIndex; i < len; i++) {
            substring += string[i];
        }
        return substring;
    };

    const split = (string, ch) => {
        let array = [], item = '';
        const len = string.length;
        for(let i = 0; i < len; i++) {
            if(string[i] !== ch) {
                item += string[i];
            } else {
                array[array.length] = item;
                item = '';
            }
        }
        array[array.length] = item;
        return array;
    };

    let list = split(input[0], ' ');

    let counter = 1;
    while((line = input[counter++])[0] !== 'P') {
        if(line[0] === 'I') { // Install
            if(indexOf(list, (game = substring(line, 8))) === -1) {
                addAt(list, list.length, game);
            }
        } else if(line[0] === 'U') {
            if(line[1] === 'n') { // Uninstall
                removeAt(list, indexOf(list, substring(line, 10)));
            } else { // Update
                if((game = removeAt(list, indexOf(list, substring(line, 7))))) {
                    addAt(list, list.length, game);
                }
            }
        } else { // Expansion
            const [ game, expansion ] = split(substring(line, 10), '-');
            if((index = indexOf(list, game)) !== -1) {
                addAt(list, index + 1, `${list[index]}:${expansion}`);
            }
        }
    }

    printArray(list, ' ');
};