example.js

index.js

class Example {
    flip(text) {
        return [...text].reduce((previousValue, currentValue) => currentValue + previousValue, '');
    }

    run(text) {
        return this.flip(padLeft(text))

        function padLeft() {
            return '000' + text;
        }
    }
}

const example = new Example();
console.log(example.run('abc'));