103 lines
2.7 KiB
JavaScript
103 lines
2.7 KiB
JavaScript
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/**
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* Make sure properties are in an easily splittable format
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*
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* @private
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* @param {String} props
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* @param {String} [sep='.'] The default separator
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* @return {String}
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*/
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function _normalizeProperty(props, sep = '.') {
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// Since we split by period, and property lookup
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// is the same by dot or [], replace bracket lookups
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// with periods
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return props.replace(/\[(.*?)]/g, sep + '$1');
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}
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/**
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* Tell if a nested object has a given property (or array a given index)
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* given an object such as a.b.c.d = 5, hasNestedProperty(a, 'b.c.d') will return true.
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*
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* @param {Object} object the object to get the property from
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* @param {String} property the path to the property as a string
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* @returns {boolean} true when property in object, false otherwise
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*/
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export function hasNestedProperty(object, property) {
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if (object && typeof object === 'object') {
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if (typeof property === 'string' && property !== '') {
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property = _normalizeProperty(property);
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let split = property.split('.');
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return split.reduce((obj, prop, idx, array) => {
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if (idx === array.length - 1) {
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return !!(obj && obj.hasOwnProperty(prop));
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}
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return obj && obj[prop];
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}, object);
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} else if (typeof property === 'number') {
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return property in object;
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}
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}
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return false;
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}
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/**
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* Get the value of a deeply nested property in an object
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*
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* @param {Object} object the object to get the property
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* @param {string} property the path to the property as a string
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* @param {string} [sep='.'] The default separator to split on
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* @return {*} the value of the property
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*/
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export function getNestedProperty(object, property, sep = '.') {
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if (isType('string', property) && property !== '') {
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// convert numbers to dot syntax
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property = _normalizeProperty(property, sep);
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const levels = property.split(sep);
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try {
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return levels.reduce((obj, prop) => obj[prop], object);
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} catch (e) {
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return undefined;
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}
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}
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return null;
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}
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/**
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* Reliably get the type of the value of a variable
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*
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* @param {*} x The variable to get the type of
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* @return {string} The name of the type
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*/
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export function getType(x) {
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// is it an array?
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if (Array.isArray(x)) {
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return 'array';
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}
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// Use typeof for truthy primitives
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if (typeof x !== 'object') {
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return (typeof x).toLowerCase();
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}
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const type = function () {
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return Object.prototype.toString.call(this).slice(8, -1);
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}
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// Otherwise, strip the type out of the '[Object x]' toString value
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return type.call(x).toLowerCase();
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}
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/**
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* Check whether the value matches the passed type name
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*
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* @param {string} type Javascript type name
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* @param {*} val The value to type check
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* @return {boolean}
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*/
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export function isType(type, val) {
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return getType(val) === String(type).toLowerCase();
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}
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