im trying to rename the keys of this array:
'oldname': [
{"name": "cat", "category": "animal"}
,{"name": "dog", "category": "animal"}
,{"name": "pig", "category": "animal"}
],
'oldname1': [
{"name": "pikachu", "category": "pokemon"}
,{"name": "Arbok", "category": "pokemon"}
,{"name": "Eevee", "category": "pokemon"}
]
i tried with this code:
const obj = {oldKey: Object.values(result)};
delete Object.assign(results, {newname: obj.oldKey})['oldname'];
console.log(result);
but I'm doing it wrong because we dont need to effect the value, it should be something like this:
'newname': [
{"name": "cat", "category": "animal"}
,{"name": "dog", "category": "animal"}
,{"name": "pig", "category": "animal"}
],
'newname1': [
{"name": "pikachu", "category": "pokemon"}
,{"name": "Arbok", "category": "pokemon"}
,{"name": "Eevee", "category": "pokemon"}
]
is there any better way to do it using javascript?
If you do not want to create a new variable/array you can use a for..of loop and Object.entries() as follows:
const
input = { 'oldname': [ {"name": "cat", "category": "animal"} ,{"name": "dog", "category": "animal"} ,{"name": "pig", "category": "animal"} ], 'oldname1': [ {"name": "pikachu", "category": "pokemon"} ,{"name": "Arbok", "category": "pokemon"} ,{"name": "Eevee", "category": "pokemon"} ] },
mapping = {'oldname':'newname','oldname1':'newname1'};
for(let [key,value] of Object.entries(input)) {
input[mapping[key]] = value;
delete input[key];
}
console.log( input );Otherwise you can do it as follows:
const
input = { 'oldname': [ {"name": "cat", "category": "animal"} ,{"name": "dog", "category": "animal"} ,{"name": "pig", "category": "animal"} ], 'oldname1': [ {"name": "pikachu", "category": "pokemon"} ,{"name": "Arbok", "category": "pokemon"} ,{"name": "Eevee", "category": "pokemon"} ] },
mapping = {'oldname':'newname','oldname1':'newname1','oldname2':'newname2','oldnamen':'newnamen'},
output = Object.fromEntries(
Object.entries(mapping).map(([oldname,newname]) => [newname, input[oldname]])
.filter(([,value]) => value)
);
console.log( input );You can use Object.entries and Object.fromEntries to do that
const replaceKeys = (data, mapping) =>
Object.fromEntries(
Object.entries(data).map(([k, v]) => [mapping[k] || k, v])
)
const data1 = {
oldName1: 1,
oldName2: 2,
anotherKey: 3
}
const mapping = {
oldName1: 'newName1',
oldName2: 'newName2'
}
console.log(replaceKeys(data1, mapping))