javascript 连接对象值
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Concatenate Object values
提问by robe007
I have a JavaScript Object and I'm sure the value of any key is an array (even empty in some case):
我有一个 JavaScript 对象，我确定任何键的值都是一个数组（在某些情况下甚至是空的）：
{key1:["a","b","c"],key2:["d","e","f"],key3:...}
Aside from using Underscore, is there any way to concatenate all the values of this Object (and create a new array)?
除了使用下划线，有没有办法连接这个对象的所有值（并创建一个新数组）？
At the moment I get the keys name using Object.keys, then I loop and concatenate.
目前我使用 获得键名Object.keys，然后我循环并连接。
Any help is appreciated.
任何帮助表示赞赏。
回答by Aliaksei Shytkin
var obj = {key1:["a","b","c"],key2:["d","e","f"]};
var arr = Object.keys(obj).reduce(function(res, v) {
return res.concat(obj[v]);
}, []);
// ["a", "b", "c", "d", "e", "f"]
回答by robe007
A simple approach is to get the values using Object.values()and concatenatethem with [].concat.apply()in this way:
一种简单的方法是使用这些值Object.values()并以这种方式将它们连接起来[].concat.apply()：
const _obj = { key1:["a","b","c"], key2:["d","e","f"], key3:["g","h","i"] }
const _arr = [].concat.apply([], Object.values(_obj))
console.log(_arr)Another similar way, is to mergeObject.values()by spreadingthem into Array.concat()like this:
另一种类似的方法是通过将它们分散成这样来合并：Object.values()Array.concat()
const _obj = { key1:["a","b","c"], key2:["d","e","f"], key3:["g","h","i"] }
const _arr = [].concat(...Object.values(_obj))
console.log(_arr)Also reducingeach value of the Object.values()and concatenatethem, you can get the same result:
同样减少 的每个值Object.values()并将它们连接起来，您可以获得相同的结果：
const _obj = { key1:["a","b","c"], key2:["d","e","f"], key3:["g","h","i"] }
const _arr = Object.values(_obj).reduce((r,c) => r.concat(c), [])
console.log(_arr)To finish, you can also use Array.prototype.flat()over each value of the Object.values(). Just keep in mind: it's not supported on all browsers.
最后，您还可以使用Array.prototype.flat()over 的每个值Object.values()。请记住：并非所有浏览器都支持它。
const _obj = { key1:["a","b","c"], key2:["d","e","f"], key3:["g","h","i"] }
const _arr = Object.values(_obj).flat()
console.log(_arr)Hope this methods could help someone out there :)
希望这种方法可以帮助那里的人:)
回答by Ivan Sivak
Check the array concatfunction
检查数组 concat函数
var obj = {key1:["a","b","c"],key2:["d","e","f"],key3:["g","h"]};
var resultArray = [];
for (var key in obj) resultArray = resultArray.concat(obj[key]);
alert(resultArray);
jsfiddle:
jsfiddle：
回答by Rakesh_Kumar
Try this: http://jsfiddle.net/6hbp5bzo/
试试这个：http: //jsfiddle.net/6hbp5bzo/
var arr= [];
var o={key1:["a","b","c"],key2:["d","e","f"]}
for(key in o){
if(o.hasOwnProperty(key)){
arr.push(o[key]);
}
}
alert(arr);
