如果我有对象的引用:
var test = {};
可能(但不是立即)具有嵌套对象,例如:
{level1: {level2: {level3: "level3"}}};
检查深度嵌套对象中是否存在属性的最佳方法是什么?
警报(测试级别1);生成未定义,但警告(test.level1.level2.level3);失败。
我目前正在做这样的事情:
if(test.level1 && test.level1.level2 && test.level1.level2.level3) {
alert(test.level1.level2.level3);
}
但我想知道是否有更好的方法。
根据@Stephane LaFlèche的回答,我提出了另一个剧本版本。
JSFiddle演示
var obj = {"a":{"b":{"c":"Hello World"}},"resTest":"potato","success":"This path exists"};
checkForPathInObject = function(object,path,value) {
var pathParts = path.split("."),
result = false;
// Check if required parameters are set; if not, return false
if(!object || typeof object == 'undefined' || !path || typeof path != 'string')
return false;
/* Loop through object keys to find a way to the path or check for value
* If the property does not exist, set result to false
* If the property is an object, update @object
* Otherwise, update result */
for(var i=0;i<pathParts.length;i++){
var currentPathPart = pathParts[i];
if(!object.hasOwnProperty( currentPathPart )) {
result = false;
} else if (object[ currentPathPart ] && path == pathParts[i]) {
result = pathParts[i];
break;
} else if(typeof object[ currentPathPart ] == 'object') {
object = object[ currentPathPart ];
} else {
result = object[ currentPathPart ];
}
}
/* */
if(typeof value != 'undefined' && value == result)
return true;
return result;
};
// Uncomment the lines below to test the script
// alert( checkForPathInObject(obj,'a.b.c') ); // Results "Hello World"
// alert( checkForPathInObject(obj,'a.success') ); // Returns false
// alert( checkForPathInObject(obj,'resTest', 'potato') ); // Returns true
使现代化
看起来lodash已经为您的所有嵌套属性获取需求添加了_.get。
_.get(countries, 'greece.sparta.playwright')
https://lodash.com/docs#get
上一个答案
lodash用户可能喜欢lodash.contrib,它有几种方法可以缓解这个问题。
获取路径
签名:_.getPath(obj:Object,ks:String|Array)
基于所描述的路径获取嵌套对象中任何深度处的值给出的钥匙。键可以以数组或点分隔字符串的形式给出。如果无法到达路径,则返回undefined。
var countries = {
greece: {
athens: {
playwright: "Sophocles"
}
}
}
};
_.getPath(countries, "greece.athens.playwright");
// => "Sophocles"
_.getPath(countries, "greece.sparta.playwright");
// => undefined
_.getPath(countries, ["greece", "athens", "playwright"]);
// => "Sophocles"
_.getPath(countries, ["greece", "sparta", "playwright"]);
// => undefined
我认为下面的脚本提供了更可读的表示。
声明函数:
var o = function(obj) { return obj || {};};
然后这样使用:
if (o(o(o(o(test).level1).level2).level3)
{
}
我称之为“悲伤小丑技巧”,因为它使用了符号o(
编辑:
这是TypeScript的版本
它在编译时提供类型检查(如果使用像Visual Studio这样的工具,还提供智能感知)
export function o<T>(someObject: T, defaultValue: T = {} as T) : T {
if (typeof someObject === 'undefined' || someObject === null)
return defaultValue;
else
return someObject;
}
用法相同:
o(o(o(o(test).level1).level2).level3
但这次intelligense奏效了!
此外,您可以设置默认值:
o(o(o(o(o(test).level1).level2).level3, "none")
这个功能怎么样?它不需要单独列出每个嵌套属性,而是保持“dot”语法(尽管是字符串),使其更具可读性。如果未找到属性,则返回undefined或指定的默认值,如果找到,则返回属性的值。
val(obj, element, default_value)
// Recursively checks whether a property of an object exists. Supports multiple-level nested properties separated with '.' characters.
// obj = the object to test
// element = (string or array) the name of the element to test for. To test for a multi-level nested property, separate properties with '.' characters or pass as array)
// default_value = optional default value to return if the item is not found. Returns undefined if no default_value is specified.
// Returns the element if it exists, or undefined or optional default_value if not found.
// Examples: val(obj1, 'prop1.subprop1.subsubprop2');
// val(obj2, 'p.r.o.p', 'default_value');
{
// If no element is being requested, return obj. (ends recursion - exists)
if (!element || element.length == 0) { return obj; }
// if the element isn't an object, then it can't have properties. (ends recursion - does not exist)
if (typeof obj != 'object') { return default_value; }
// Convert element to array.
if (typeof element == 'string') { element = element.split('.') }; // Split on dot (.)
// Recurse into the list of nested properties:
let first = element.shift();
return val(obj[first], element, default_value);
}