是否有一个聪明的(即优化)方法重命名一个关键在javascript对象?
一种非优化的方式是:
o[ new_key ] = o[ old_key ];
delete o[ old_key ];
是否有一个聪明的(即优化)方法重命名一个关键在javascript对象?
一种非优化的方式是:
o[ new_key ] = o[ old_key ];
delete o[ old_key ];
当前回答
const data = res
const lista = []
let newElement: any
if (data && data.length > 0) {
data.forEach(element => {
newElement = element
Object.entries(newElement).map(([key, value]) =>
Object.assign(newElement, {
[key.toLowerCase()]: value
}, delete newElement[key], delete newElement['_id'])
)
lista.push(newElement)
})
}
return lista
其他回答
简单地这么做会有什么问题吗?
someObject = {...someObject, [newKey]: someObject.oldKey}
delete someObject.oldKey
如果愿意,可以将其包装在函数中:
const renameObjectKey = (object, oldKey, newKey) => {
// if keys are the same, do nothing
if (oldKey === newKey) return;
// if old key doesn't exist, do nothing (alternatively, throw an error)
if (!object.oldKey) return;
// if new key already exists on object, do nothing (again - alternatively, throw an error)
if (object.newKey !== undefined) return;
object = { ...object, [newKey]: object[oldKey] };
delete object[oldKey];
return { ...object };
};
// in use
let myObject = {
keyOne: 'abc',
keyTwo: 123
};
// avoids mutating original
let renamed = renameObjectKey(myObject, 'keyTwo', 'renamedKey');
console.log(myObject, renamed);
// myObject
/* {
"keyOne": "abc",
"keyTwo": 123,
} */
// renamed
/* {
"keyOne": "abc",
"renamedKey": 123,
} */
本页列出的一些解决方案有一些副作用:
影响键在对象中的位置,将其添加到底部(如果这对你来说很重要) 不能在IE9+中工作(如果这对你来说很重要的话)
下面是一个解决方案,它保持键的位置在相同的地方,并在IE9+兼容,但必须创建一个新的对象,可能不是最快的解决方案:
function renameObjectKey(oldObj, oldName, newName) {
const newObj = {};
Object.keys(oldObj).forEach(key => {
const value = oldObj[key];
if (key === oldName) {
newObj[newName] = value;
} else {
newObj[key] = value;
}
});
return newObj;
}
请注意:IE9在严格模式下可能不支持forEach
如果有人需要重命名object的键:
const renameKeyObject = (obj, oldKey, newKey) => { 如果 (旧键 === 新键) 返回 volj; Object.keys(obj).forEach((key) => { if (key === oldKey) { obj[newKey] = obj[key]; 删除 obj[键]; } else if (obj[key] !== null &&; typeof obj[key] === “object”) { obj[key] = renameKeyObject(obj[key], oldKey, newKey); } }); 返回卷; };
如果你要改变源对象,ES6可以在一行中完成。
delete Object.assign(o, {[newKey]: o[oldKey] })[oldKey];
如果你想创建一个新对象,可以用两行。
const newObject = {};
delete Object.assign(newObject, o, {[newKey]: o[oldKey] })[oldKey];
我想这么做
const originalObj = {
a: 1,
b: 2,
c: 3, // need replace this 'c' key into 'd'
};
const { c, ...rest } = originalObj;
const newObj = { ...rest, d: c };
console.log({ originalObj, newObj });