Recursively search an Object and return all matches

object_recursively_search.js

// File is a POF of how to recursively search an object
class User {
	constructor() {
		this.username = "john_doe";
		this.password = "password";
	}

	/**
	 * Deep search any object like types and return
	 * one or more values for the property name
	 * @param  {String} keyToFind
	 * @param  {Object} user_settings
	 * @param  {Array} values
	 * @return {* || Array[*,]}
	 */
	getField(keyToFind, user_settings, values = new Array()) {
		// Return the user settings or the child
		// of the user settings
		var entries = user_settings === undefined ? Object.entries(this) : Object.entries(user_settings);

		// Iterate over the entries array
		for (const [key, field] of entries) {
			// Return the value if the key is found
			if (key === keyToFind) {
				values.push(field);
			}

			// Key was not found and only continue recursively if the value of the
			// key is an object like type
			if (field.constructor === Object || (typeof field === "object" && field !== null)) {
				// Continue down the tree
				this.getField(keyToFind, field, values);
			}
		}

		// Return a single value or array of multiple values
		return values.length === 1 ? values[0] : values;
	}

	/**
	 * Deep search any object like types and set
	 * a value to that property
	 * @param  {String} keyToFind
	 * @param  {*} value
	 * @param  {Object} user_settings
	 * @return {Boolean}
	 */
	setField(keyToFind, value, user_settings) {
		// Return the user settings or the child
		// of the user settings
		var entries = user_settings === undefined ? this : user_settings;

		// Iterate over the entries array
		for (const entry in entries) {
			let field = entries[entry];

			// Return the value if the key is found
			if (entries.hasOwnProperty(keyToFind)) {
				entries[keyToFind] = value;
				return true;
			}

			// Key was not found and only continue recursively if the value of the
			// key is an object like type
			if (field.constructor === Object || (typeof field === "object" && field !== null)) {
				// Continue down the tree
				this.setField(keyToFind, value, field);
			}
		}

		return false;
	}
}