Truncates long strings and arrays in object. It is useful for logging

truncate-object.js

const truncateObject = o => {
    if (!o) {
        return o;
    }
    if (typeof o === 'string') {
        return o.substring(0, 64);
    }
    if (Array.isArray(o)) {
        return o.slice(0, 5).map(x => truncateObject(x));
    }
    if (typeof o === 'object') {
        const r = {};
        for (let i in o) {
            r[i] = truncateObject(o[i]);
        }
        return r;
    }
    return o;
}