ngrx-forms
Version:
Proper integration of forms in Angular 4 applications using ngrx
92 lines • 12.1 kB
JavaScript
export function isEmpty(obj) {
return Object.keys(obj).length === 0;
}
const defaultOptions = {
treatUndefinedAndMissingKeyAsSame: false,
};
export function deepEquals(_1, _2, options = {}) {
const { treatUndefinedAndMissingKeyAsSame } = Object.assign({}, defaultOptions, options);
const leftChain = [];
const rightChain = [];
function compare2Objects(x, y) {
let p;
// remember that NaN === NaN returns false
// and isNaN(undefined) returns true
if (isNaN(x) && isNaN(y) && typeof x === 'number' && typeof y === 'number') {
return true;
}
// Compare primitives and functions.
// Check if both arguments link to the same object.
// Especially useful on the step where we compare prototypes
if (x === y) {
return true;
}
// Works in case when functions are created in constructor.
// Comparing dates is a common scenario. Another built-ins?
// We can even handle functions passed across iframes
if ((typeof x === 'function' && typeof y === 'function') ||
(x instanceof Date && y instanceof Date) ||
(x instanceof RegExp && y instanceof RegExp) ||
(x instanceof String && y instanceof String) ||
(x instanceof Number && y instanceof Number)) {
return x.toString() === y.toString();
}
// At last checking prototypes as good as we can
if (!(x instanceof Object && y instanceof Object)) {
return false;
}
if (x.isPrototypeOf(y) || y.isPrototypeOf(x)) {
return false;
}
if (x.constructor !== y.constructor) {
return false;
}
// Check for infinitive linking loops
if (leftChain.indexOf(x) > -1 || rightChain.indexOf(y) > -1) {
return false;
}
// Quick checking of one object being a subset of another.
for (p in y) {
if (treatUndefinedAndMissingKeyAsSame && y.hasOwnProperty(p) && !x.hasOwnProperty(p) && y[p] === undefined) {
continue;
}
if (y.hasOwnProperty(p) !== x.hasOwnProperty(p)) {
return false;
}
else if (typeof y[p] !== typeof x[p]) {
return false;
}
}
// tslint:disable:forin
for (p in x) {
if (y.hasOwnProperty(p) !== x.hasOwnProperty(p)) {
if (!treatUndefinedAndMissingKeyAsSame || !x.hasOwnProperty(p) || y.hasOwnProperty(p) || x[p] !== undefined) {
return false;
}
}
switch (typeof (x[p])) {
case 'object':
case 'function':
leftChain.push(x);
rightChain.push(y);
if (!compare2Objects(x[p], y[p])) {
return false;
}
leftChain.pop();
rightChain.pop();
break;
default:
if (x[p] !== y[p]) {
return false;
}
break;
}
}
return true;
}
if (arguments.length <= 1) {
throw new Error('Need two or more arguments to compare');
}
return compare2Objects(_1, _2);
}
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Another built-ins?\r\n    // We can even handle functions passed across iframes\r\n    if ((typeof x === 'function' && typeof y === 'function') ||\r\n      (x instanceof Date && y instanceof Date) ||\r\n      (x instanceof RegExp && y instanceof RegExp) ||\r\n      (x instanceof String && y instanceof String) ||\r\n      (x instanceof Number && y instanceof Number)) {\r\n      return x.toString() === y.toString();\r\n    }\r\n\r\n    // At last checking prototypes as good as we can\r\n    if (!(x instanceof Object && y instanceof Object)) {\r\n      return false;\r\n    }\r\n\r\n    if (x.isPrototypeOf(y) || y.isPrototypeOf(x)) {\r\n      return false;\r\n    }\r\n\r\n    if (x.constructor !== y.constructor) {\r\n      return false;\r\n    }\r\n\r\n    // Check for infinitive linking loops\r\n    if (leftChain.indexOf(x) > -1 || rightChain.indexOf(y) > -1) {\r\n      return false;\r\n    }\r\n\r\n    // Quick checking of one object being a subset of another.\r\n    for (p in y) {\r\n      if (treatUndefinedAndMissingKeyAsSame && y.hasOwnProperty(p) && !x.hasOwnProperty(p) && y[p] === undefined) {\r\n        continue;\r\n      }\r\n\r\n      if (y.hasOwnProperty(p) !== x.hasOwnProperty(p)) {\r\n        return false;\r\n      } else if (typeof y[p] !== typeof x[p]) {\r\n        return false;\r\n      }\r\n    }\r\n\r\n    // tslint:disable:forin\r\n    for (p in x) {\r\n      if (y.hasOwnProperty(p) !== x.hasOwnProperty(p)) {\r\n        if (!treatUndefinedAndMissingKeyAsSame || !x.hasOwnProperty(p) || y.hasOwnProperty(p) || x[p] !== undefined) {\r\n          return false;\r\n        }\r\n      }\r\n\r\n      switch (typeof (x[p])) {\r\n        case 'object':\r\n        case 'function':\r\n\r\n          leftChain.push(x);\r\n          rightChain.push(y);\r\n\r\n          if (!compare2Objects(x[p], y[p])) {\r\n            return false;\r\n          }\r\n\r\n          leftChain.pop();\r\n          rightChain.pop();\r\n          break;\r\n\r\n        default:\r\n          if (x[p] !== y[p]) {\r\n            return false;\r\n          }\r\n          break;\r\n      }\r\n    }\r\n\r\n    return true;\r\n  }\r\n\r\n  if (arguments.length <= 1) {\r\n    throw new Error('Need two or more arguments to compare');\r\n  }\r\n\r\n  return compare2Objects(_1, _2);\r\n}\r\n"]}