es6：隐式数组对象

Question

I have records :

 let a =  [{
            "resource" : "user",

            "permissions" : [ 
                "add", 
                "list", 
                "verify", 
                "add-credit", 
                "deactive", 
                "trash", 
                "edit", 
                "impersonate", 
                "active"
            ]
        }, 
        {
            "resource" : "company",

            "permissions" : [ 
                "list", 
                "verify", 
                "pending", 
                "reject"
            ]
        }];

I want to convert it to :

{"user":[ 
                "add", 
                "list", 
                "verify", 
                "add-credit", 
                "deactive", 
                "trash", 
                "edit", 
                "impersonate", 
                "active"
         ], 
        "company" : [ 
                "list", 
                "verify", 
                "pending", 
                "reject"
            ]
     };

This can be done via the custom function to foreach and store the result to another variable.

What I want is to do it with map , filter , or any new feature of javascript in es6.

I have tried using map .

 a.map(function (res){return res.resource})

Answer 1

Use reduce

var output = a.reduce( ( acc, c ) => {
  acc[ c.resource ] = c.permissions;
  return acc; //return accumulator
} ,{}) // initialize accumulator to {}

Explanation

• Use reduce to iterate and initialize the accumulator acc as empty object {} .
• For each item c in the array a
  • Assign c.resource value ( user and company ) as property to acc (accumulator) and value of that property being c.permissions
  • return the accumulator acc .

Answer 2

Although this has been answered by using reduce but this is just to clarify that it can be done this way which is much more understanding if you do not understand how reduce works or if you do not want to use reduce

 let a = [{ "resource" : "user", "permissions" : [ "add", "list", "verify", "add-credit", "deactive", "trash", "edit", "impersonate", "active" ] }, { "resource" : "company", "permissions" : [ "list", "verify", "pending", "reject" ] }]; var res = {}; a.forEach((obj)=>{ res[obj.resource] = obj.permissions; }); console.log(res);