添加到JS对象的有效方法？

Question

我想在对象中添加一堆属性，每个属性都是一个空数组。我的实现似乎很冗长。

let obj = {};
obj.x = [];
obj.y = [];
obj.z = [];

... ad infinitum

还有其他方法，比如反向对象解构吗？

Answer 1

你可以尝试

var obj = {};
var keys = [ "x", "y", "z" ];
keys.forEach( function( val ){ 
  obj[ val ] = []; 
});

Answer 2

＆＃13;

＆＃13;

let obj = {};

for(let key of "xyz")
    obj[key] = []

console.log(obj)

＆＃13;

＆＃13;

＆＃13;

Answer 3

另一种方法是在一行中完成

var obj = ['x', 'y', 'z'].reduce((obj, key) => (obj[key] = [], obj), {})

然后它可以重复使用

＆＃13;

＆＃13;

var fn = (obj, key) => (obj[key] = [], obj);
var dest = {};

var same = ['x', 'y', 'z'].reduce(fn, dest)

console.log(dest)
console.log(same === dest)

＆＃13;

＆＃13;

＆＃13;