严格相等运算符将告诉您两个对象类型是否相等。然而,是否有一种方法来判断两个对象是否相等,就像Java中的哈希码值一样?
堆栈溢出问题JavaScript中有hashCode函数吗?类似于这个问题,但需要一个更学术的答案。上面的场景说明了为什么有必要有一个,我想知道是否有等效的解决方案。
严格相等运算符将告诉您两个对象类型是否相等。然而,是否有一种方法来判断两个对象是否相等,就像Java中的哈希码值一样?
堆栈溢出问题JavaScript中有hashCode函数吗?类似于这个问题,但需要一个更学术的答案。上面的场景说明了为什么有必要有一个,我想知道是否有等效的解决方案。
当前回答
从我的个人库中取出,我经常用它来工作。下面的函数是一个宽大的递归深度等号,它不检查
阶级平等 继承的值 价值观严格平等
我主要用这个来检查我是否得到了对各种API实现的相等的回复。可能会出现实现差异(如字符串与数字)和额外的空值。
它的实现非常简单(如果去掉所有注释的话)
/** Recursively check if both objects are equal in value *** *** This function is designed to use multiple methods from most probable *** (and in most cases) valid, to the more regid and complex method. *** *** One of the main principles behind the various check is that while *** some of the simpler checks such as == or JSON may cause false negatives, *** they do not cause false positives. As such they can be safely run first. *** *** # !Important Note: *** as this function is designed for simplified deep equal checks it is not designed *** for the following *** *** - Class equality, (ClassA().a = 1) maybe valid to (ClassB().b = 1) *** - Inherited values, this actually ignores them *** - Values being strictly equal, "1" is equal to 1 (see the basic equality check on this) *** - Performance across all cases. This is designed for high performance on the *** most probable cases of == / JSON equality. Consider bench testing, if you have *** more 'complex' requirments *** *** @param objA : First object to compare *** @param objB : 2nd object to compare *** @param .... : Any other objects to compare *** *** @returns true if all equals, or false if invalid *** *** @license Copyright by eugene@picoded.com, 2012. *** Licensed under the MIT license: http://opensource.org/licenses/MIT **/ function simpleRecusiveDeepEqual(objA, objB) { // Multiple comparision check //-------------------------------------------- var args = Array.prototype.slice.call(arguments); if(args.length > 2) { for(var a=1; a<args.length; ++a) { if(!simpleRecusiveDeepEqual(args[a-1], args[a])) { return false; } } return true; } else if(args.length < 2) { throw "simpleRecusiveDeepEqual, requires atleast 2 arguments"; } // basic equality check, //-------------------------------------------- // if this succed the 2 basic values is equal, // such as numbers and string. // // or its actually the same object pointer. Bam // // Note that if string and number strictly equal is required // change the equality from ==, to === // if(objA == objB) { return true; } // If a value is a bsic type, and failed above. This fails var basicTypes = ["boolean", "number", "string"]; if( basicTypes.indexOf(typeof objA) >= 0 || basicTypes.indexOf(typeof objB) >= 0 ) { return false; } // JSON equality check, //-------------------------------------------- // this can fail, if the JSON stringify the objects in the wrong order // for example the following may fail, due to different string order: // // JSON.stringify( {a:1, b:2} ) == JSON.stringify( {b:2, a:1} ) // if(JSON.stringify(objA) == JSON.stringify(objB)) { return true; } // Array equality check //-------------------------------------------- // This is performed prior to iteration check, // Without this check the following would have been considered valid // // simpleRecusiveDeepEqual( { 0:1963 }, [1963] ); // // Note that u may remove this segment if this is what is intended // if( Array.isArray(objA) ) { //objA is array, objB is not an array if( !Array.isArray(objB) ) { return false; } } else if( Array.isArray(objB) ) { //objA is not array, objB is an array return false; } // Nested values iteration //-------------------------------------------- // Scan and iterate all the nested values, and check for non equal values recusively // // Note that this does not check against null equality, remove the various "!= null" // if this is required var i; //reuse var to iterate // Check objA values against objB for (i in objA) { //Protect against inherited properties if(objA.hasOwnProperty(i)) { if(objB.hasOwnProperty(i)) { // Check if deep equal is valid if(!simpleRecusiveDeepEqual( objA[i], objB[i] )) { return false; } } else if(objA[i] != null) { //ignore null values in objA, that objB does not have //else fails return false; } } } // Check if objB has additional values, that objA do not, fail if so for (i in objB) { if(objB.hasOwnProperty(i)) { if(objB[i] != null && !objA.hasOwnProperty(i)) { //ignore null values in objB, that objA does not have //else fails return false; } } } // End of all checks //-------------------------------------------- // By reaching here, all iteration scans have been done. // and should have returned false if it failed return true; } // Sanity checking of simpleRecusiveDeepEqual (function() { if( // Basic checks !simpleRecusiveDeepEqual({}, {}) || !simpleRecusiveDeepEqual([], []) || !simpleRecusiveDeepEqual(['a'], ['a']) || // Not strict checks !simpleRecusiveDeepEqual("1", 1) || // Multiple objects check !simpleRecusiveDeepEqual( { a:[1,2] }, { a:[1,2] }, { a:[1,2] } ) || // Ensure distinction between array and object (the following should fail) simpleRecusiveDeepEqual( [1963], { 0:1963 } ) || // Null strict checks simpleRecusiveDeepEqual( 0, null ) || simpleRecusiveDeepEqual( "", null ) || // Last "false" exists to make the various check above easy to comment in/out false ) { alert("FATAL ERROR: simpleRecusiveDeepEqual failed basic checks"); } else { //added this last line, for SO snippet alert on success alert("simpleRecusiveDeepEqual: Passed all checks, Yays!"); } })();
其他回答
下面的一些解决方案在性能、功能和风格方面存在问题……它们没有经过充分的考虑,其中一些在不同的情况下失败了。我试图在自己的解决方案中解决这个问题,我非常感谢您的反馈:
http://stamat.wordpress.com/javascript-object-comparison/
//Returns the object's class, Array, Date, RegExp, Object are of interest to us
var getClass = function(val) {
return Object.prototype.toString.call(val)
.match(/^\[object\s(.*)\]$/)[1];
};
//Defines the type of the value, extended typeof
var whatis = function(val) {
if (val === undefined)
return 'undefined';
if (val === null)
return 'null';
var type = typeof val;
if (type === 'object')
type = getClass(val).toLowerCase();
if (type === 'number') {
if (val.toString().indexOf('.') > 0)
return 'float';
else
return 'integer';
}
return type;
};
var compareObjects = function(a, b) {
if (a === b)
return true;
for (var i in a) {
if (b.hasOwnProperty(i)) {
if (!equal(a[i],b[i])) return false;
} else {
return false;
}
}
for (var i in b) {
if (!a.hasOwnProperty(i)) {
return false;
}
}
return true;
};
var compareArrays = function(a, b) {
if (a === b)
return true;
if (a.length !== b.length)
return false;
for (var i = 0; i < a.length; i++){
if(!equal(a[i], b[i])) return false;
};
return true;
};
var _equal = {};
_equal.array = compareArrays;
_equal.object = compareObjects;
_equal.date = function(a, b) {
return a.getTime() === b.getTime();
};
_equal.regexp = function(a, b) {
return a.toString() === b.toString();
};
// uncoment to support function as string compare
// _equal.fucntion = _equal.regexp;
/*
* Are two values equal, deep compare for objects and arrays.
* @param a {any}
* @param b {any}
* @return {boolean} Are equal?
*/
var equal = function(a, b) {
if (a !== b) {
var atype = whatis(a), btype = whatis(b);
if (atype === btype)
return _equal.hasOwnProperty(atype) ? _equal[atype](a, b) : a==b;
return false;
}
return true;
};
如何确定部分对象(partial <T>)等于typescript中的原始对象(T)。
function compareTwoObjects<T>(original: T, partial: Partial<T>): boolean {
return !Object.keys(partial).some((key) => partial[key] !== original[key]);
}
附注:最初我打算提出一个有答案的新问题。但这样的问题已经存在,并被标记为重复题。
不同。如果对象中键的顺序不重要,我不需要知道所述对象的原型。使用总是有用的。
const object = {};
JSON.stringify(object) === "{}" will pass but {} === "{}" will not
这是对以上所有内容的补充,而不是替代。如果需要快速浅比较对象,而不需要检查额外的递归情况。这是一个镜头。
这比较:1)自己的属性数量相等,2)键名相等,3)如果bCompareValues == true,对应的属性值及其类型相等(三重相等)
var shallowCompareObjects = function(o1, o2, bCompareValues) {
var s,
n1 = 0,
n2 = 0,
b = true;
for (s in o1) { n1 ++; }
for (s in o2) {
if (!o1.hasOwnProperty(s)) {
b = false;
break;
}
if (bCompareValues && o1[s] !== o2[s]) {
b = false;
break;
}
n2 ++;
}
return b && n1 == n2;
}
EDIT: This method is quite flawed, and is rife with its own issues. I don't recommend it, and would appreciate some down-votes! It is problematic because 1) Some things can not be compared (i.e. functions) because they can not be serialized, 2) It isn't a very fast method of comparing, 3) It has ordering issues, 4) It can have collision issues/false positives if not properly implemented, 5) It can't check for "exactness" (===), and instead is based of value equality, which is oftentimes not what is desired in a comparison method.
这个问题的一个简单解决方案是对JSON字符串进行排序(每个字符),但很多人没有意识到这一点。这通常也比这里提到的其他解决方案更快:
function areEqual(obj1, obj2) {
var a = JSON.stringify(obj1), b = JSON.stringify(obj2);
if (!a) a = '';
if (!b) b = '';
return (a.split('').sort().join('') == b.split('').sort().join(''));
}
关于这个方法的另一个有用的事情是,您可以通过向JSON传递一个“replace”函数来筛选比较。stringify函数(https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify#Example_of_using_replacer_parameter)。下面只比较所有命名为“derp”的对象键:
function areEqual(obj1, obj2, filter) {
var a = JSON.stringify(obj1, filter), b = JSON.stringify(obj2, filter);
if (!a) a = '';
if (!b) b = '';
return (a.split('').sort().join('') == b.split('').sort().join(''));
}
var equal = areEqual(obj1, obj2, function(key, value) {
return (key === 'derp') ? value : undefined;
});