I have this javascript objects:
var arr = [{id:'124',name:'qqq'}, {id:'589',name:'www'}, {id:'45',name:'eee'}, {id:'567',name:'rrr'}] I need to rename properties with name in arr1 to title:
var arr = [{id:'124',title:'qqq'}, {id:'589',title:'www'}, {id:'45',title:'eee'}, {id:'567',title:'rrr'}] What is elegant way to implement it in Javascript?
Use delete to remove a property from an object. Use obj['newProperty'] to assign newProperty to an object.
var arr = [{id:'124',name:'qqq'}, {id:'589',name:'www'}, {id:'45',name:'eee'}, {id:'567',name:'rrr'}]; arr.forEach( function(data) { data['title'] = data['name']; delete data['name']; }); console.log(arr);You can also use array#map
const arr = [{ id: '124', name: 'qqq' }, { id: '589', name: 'www' }, { id: '45', name: 'eee' }, { id: '567', name: 'rrr' } ], result = arr.map(({name, ...rest}) => ({...rest, title: name})); console.log(result);Use map :
var arr = [{ id: '124', name: 'qqq' }, { id: '589', name: 'www' }, { id: '45', name: 'eee' }, { id: '567', name: 'rrr' } ] arr = arr.map((e) => { return { id: e.id, title: e.name } }); console.log(arr);
arr.map(e => { return { id: e.id, title: e.name }}); 
it is not possible to change the name of property, but add a new one and delete the old one, i also got the code from somewhere dont remeber the exact source
function changeKey(originalKey, newKey, arr) { var newArr = []; for(var i = 0; i < arr.length; i++) { var obj = arr[i]; obj[newKey] = obj[originalKey]; delete(obj[originalKey]); newArr.push(obj); } return newArr; } Here's how you delete key and value and assign to new key:
var arr = [{id:'124',name:'qqq'}, {id:'589',name:'www'}, {id:'45',name:'eee'}, {id:'567',name:'rrr'}] arr.forEach(function(o) { Object.defineProperty(o, 'title', Object.getOwnPropertyDescriptor(o, 'name')); delete o['name']; }); console.log(arr);
