如何获取存在于数组属性中的值？

Question

I have an array from a response in which I need to get the value that is present in the salary attribute of args array of id Proprety attribute from each object/response. How can achieve this?

 var arr = [
    [
        {
            id: "alex",
            idProperty: {
                args: [
                    {
                    name: "alex_name"
                    }, 
                    { 
                    salary: "16L" 
                    }
                ]
            }
        },
        {
            id: "john",
            idProperty: {
                args: [
                    {
                    name: "john_name"
                    }, 
                    { 
                    salary: "14L" 
                    }
                ]
            }
        }
   ]   
 ];

EDIT: thanks to every one for all the answers for the above query but how to get the same salary attribute if the structure is :

case 1 :

var arr = {
            [
                id: "alex",
                idProperty: {
                    args: [
                        {
                        name: "alex_name"
                        }, 
                        { 
                        salary: "16L" 
                        }
                    ]
                }
            ],
            [
                id: "john",
                idProperty: {
                    args: [
                        {
                        name: "john_name"
                        }, 
                        { 
                        salary: "14L" 
                        }
                    ]
                }
            ]
     };

case - 2

var arr = [
                {
                    id: "alex",
                    idProperty: {
                        args: [
                            {
                            name: "alex_name"
                            }, 
                            { 
                            salary: "16L" 
                            }
                        ]
                    }
                },
                {
                    id: "john",
                    idProperty: {
                        args: [
                            {
                            name: "john_name"
                            }, 
                            { 
                            salary: "14L" 
                            }
                        ]
                    }
                }
         ];

I am sorry to ask if this is so simple as I am really new to react native and java script and so confused with various scenarios.

Answer 1

Extract the 'idProperty' Object and then iterate over the args array in it

 var arr = [ [ { id: "alex", idProperty: { args: [ { name: "alex_name" }, { salary: "16L" } ] } }, { id: "john", idProperty: { args: [ { name: "john_name" }, { salary: "14L" } ] } } ] ]; const accu = []; const output = arr[0].forEach(({idProperty}) => { idProperty.args.forEach(({salary}) => { if(salary)accu.push(salary); }); }); console.log(accu); 

Answer 2

You can use a for

var salaries
for(var i = 0; i <arr.length; i++){
   salaries[arr[i].id] = arr.idProperty.args.salary;
}

You'll have something like this:

console.log(salaries);
[
'alex':'16L',
'john':'14L'
]

UPDATE

_.each(arr, function (value, key) {
      salaries[value.id] = _.find(value.idProperty.args, function(o) { return o.salary != undefined; }).salary;  
});

Answer 3

Hi You can try below approach -

var newarr = arr[0];
for(var i=0; i<newarr.length; i++)
{
    var salValue = newarr[i].idProperty.args[1].salary
    console.log('Salary value :' + salValue);
}

Answer 4

map over the nested array and find the salary object in the args array of each object. This returns an array of salary figures. I've used find instead of accessing the second element of the args array in case the salary object isn't always the second element, and some object destructuring .

 var arr = [[{"id":"alex","idProperty":{"args":[{"name":"alex_name"},{"salary":"16L"}]}},{"id":"john","idProperty":{"args":[{"name":"john_name"},{"salary":"14L"}]}}]]; // `map` over the inner array, destructure the args array from each object const salaries = arr[0].map(({ idProperty: { args } }) => // find the object in the args array that has the salary key // and return its salary value args.find(obj => Object.keys(obj)[0] === 'salary').salary ); console.log(salaries); 

Answer 5

After trying randomly for a long time I got answer for the case 2

const ids = array.map( a => return a.map(obj => obj.idProperty.args[1].salary));

but I am unable to achieve the answer at this point obj.idProperty.args[1].salary without using arg[1] as Andy got using lodash.