我有以下对象数组:
var arr = [
{
id : "a1",
guid : "sdfsfd",
...
value : "abc",
status: "active"
},
{
id : "a2",
guid : "sdfsfd",
...
value : "def",
status: "inactive"
},
{
id : "a2",
guid : "sdfsfd",
...
value : "def"
},
...
]
如何设置每个对象的"状态"属性为" Active" 。因此,由此产生的数组将是:
var arr = [
{
id : "a1",
guid : "sdfsfd",
...
value : "abc",
status: "active"
},
{
id : "a2",
guid : "sdfsfd",
...
value : "def",
status: "active"
},
{
id : "a2",
guid : "sdfsfd",
...
value : "def",
status: "active"
},
...
]
此外,如果不存在,则应创建"活动"属性。
我可以使用循环来做到这一点。但是我非常确定Lodash可以在一行中这样做:
arr = _.set_property(arr, "status", "active");
you 不需要lodash
。
第一个对象缺少您的状态属性,并将添加。
显示三种方法
不变版本(我们使用map
创建一个新数组)
const arrImmutableVersion = arr.map(e => ({...e, status: "active"}));
可变版本(我们更改原始数组)
arr.forEach((el)=>{el.status = "active";})
或
arr.forEach(function(el){el.status = "active";})
var arr = [
{
id : "a1",
guid : "sdfsfd",
value : "abc"
},
{
id : "a2",
guid : "sdfsfd",
value : "def",
status: "inactive"
},
{
id : "a2",
guid : "sdfsfd",
value : "def",
status: "active"
}
];
// SHOWING THREE WAYS HOW YOU CAN DO IT
// MUTABLE VERSIONS - We change the original array
arr.forEach((el)=>{el.status = "active";}) // ES6
// or
arr.forEach(function(el){el.status = "active";})
//or
// IMMUTABLE VERSION - We create a new array using `map`
const arrImmutableVersion = arr.map(e => ({...e, status: "active"})); // ES6
//--------------------------------------------------------------
// RESULTS:
console.log("logging results of object 'arr'");
console.log(arr);
console.log("---------------------------------------------------------");
console.log("logging results of object 'arrImmutableVersion'");
console.log(arrImmutableVersion);
的确,您不需要 lodash,但是问题是标记的lodash,并且使用lodash提供了一些有用的防御,可以降低错误的风险。此解决方案利用_。foreach和_.set
// _.forEach won't throw errors if arr is not an array...
_.forEach(arr, function (obj) {
// _.set won't throw errors if obj is not an object. With more complex objects, if a portion of the path doesn't exist, _.set creates it
_.set(obj, 'status', 'active');
});
如果您想使其抽象化,则可以构建lodash mixin:
_.mixin({
setProperty: function(arr, key, val) {
_.forEach(arr, function (obj) {
_.set(obj, path, val);
});
}
});
然后,您可以按照您描述的准确使用:
_.setProperty( arr, 'status', 'active' );
一种更简单,更清洁的方式!
如果您想以适当的方式使用Func编程
myArray = myArray.map(arrayElem => {
arrayElem.property = newValue
return arrayElem
})