safety-results-over-time/src/util/clone.js

Chart showing population averages for lab measures, vital signs and other related measures during the course of a clinical trial.

export default function clone(obj) {
    let copy;

    //boolean, number, string, null, undefined
    if ('object' != typeof obj || null == obj) return obj;

    //date
    if (obj instanceof Date) {
        copy = new Date();
        copy.setTime(obj.getTime());
        return copy;
    }

    //array
    if (obj instanceof Array) {
        copy = [];
        for (var i = 0, len = obj.length; i < len; i++) {
            copy[i] = clone(obj[i]);
        }
        return copy;
    }

    //object
    if (obj instanceof Object) {
        copy = {};
        for (var attr in obj) {
            if (obj.hasOwnProperty(attr)) copy[attr] = clone(obj[attr]);
        }
        return copy;
    }

    throw new Error('Unable to copy [obj]! Its type is not supported.');
}