HummingBirdAnimeClient/frontEndSrc/js/fns.js
Timothy J. Warren 288cbb3e20
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Make error handling for ajax list incrementing more robust
2023-03-17 11:09:43 -04:00

103 lines
2.7 KiB
JavaScript

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