i need to map an object like this
let obj = {
a : { value : 5, meta: "sss" },
b : { value : 1, meta: "rrr" },
a : { value : 6, meta: "nnn" },
}`
to obtain and object like this
{ a: 5, b: 1, c:6}
I can't get the "key" as a string.
I've tried:
let yyy = Object.keys(obj).map(function (key) {
return { key: obj[key].value };
});
But it produces an "Array" (while I need an Object) of {key : 5}... with the string "key" instead of the name of the key.
You could use .reduce
let obj = {
a : { value : 5, meta: "sss" },
b : { value : 1, meta: "rrr" },
c : { value : 6, meta: "nnn" },
}
var res = Object.keys(obj).reduce((acc, elem)=>{
acc[elem] = obj[elem].value;
return acc;
},{});
console.log(res)You could get the entries and map the key and property value for a new object.
let object = { a : { value: 5, meta: "sss" }, b : { value: 1, meta: "rrr" }, c : { value: 6, meta: "nnn" } },
result = Object.fromEntries(Object
.entries(object)
.map(([key, { value }]) => [key, value])
);
console.log(result);Try this below :
Use Object.keys on your input.
let obj = { 'a': {value: 5, meta: "sss"},
'b': {value: 1, meta: "rrr"},
'c': {value: 6, meta: "nnn"},
};
let output = {};
Object.keys(obj).map(function (item) {
output[item] = obj[item]['value']
});
console.log(output)
Output : { a: 5, b: 1, c:6}
map returns a new array. Not fit for this case. A better alternative would be forEachTry using reduce instead of map..
const obj = {
a : { value : 5, meta: "sss" },
b : { value : 1, meta: "rrr" },
c : { value : 6, meta: "nnn" },
}
const res = Object.keys(obj).reduce( (res, key) => {
res[key] = obj[key].value
return res;
}, {});
console.log(res)
You can use reduce function to achieve your result.
let result = Object.keys(obj).reduce((acc,k) => {
return {
...acc,
[k]:obj[k].value
};
},{})
console.log(result); // {"a":5,"b":1,"c":6}
I hope it helps.
Using for..of loop and destructuring values
let obj = {
a : { value : 5, meta: "sss" },
b : { value : 1, meta: "rrr" },
c : { value : 6, meta: "nnn" },
}
const data = Object.entries(obj);
let result={};
for(let [key, {value}] of data) {
result[key] = value;
}
console.log(result);
