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
我的方法,改编好的@Mulhoon typescript帖子,用于更改多个键:
const renameKeys = <
TOldKey extends keyof T,
TNewkey extends string,
T extends Record<string, unknown>
>(
keys: {[ key: string]: TNewkey extends TOldKey ? never : TNewkey },
obj: T
) => Object
.keys(obj)
.reduce((acc, key) => ({
...acc,
...{ [keys[key] || key]: obj[key] }
}), {});
renameKeys({id: 'value', name: 'label'}, {id: 'toto_id', name: 'toto', age: 35});
其他回答
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 });
我会这样做:
function renameKeys(dict, keyMap) {
return _.reduce(dict, function(newDict, val, oldKey) {
var newKey = keyMap[oldKey] || oldKey
newDict[newKey] = val
return newDict
}, {})
}
为每个键添加前缀:
const obj = {foo: 'bar'}
const altObj = Object.fromEntries(
Object.entries(obj).map(([key, value]) =>
// Modify key here
[`x-${key}`, value]
)
)
// altObj = {'x-foo': 'bar'}
在您最喜欢的编辑器中尝试一下
const obj = {1: 'a', 2: 'b', 3: 'c'}
const OLD_KEY = 1
const NEW_KEY = 10
const { [OLD_KEY]: replaceByKey, ...rest } = obj
const new_obj = {
...rest,
[NEW_KEY]: replaceByKey
}
重命名键,但避免改变原始对象参数
oldJson=[{firstName:'s1',lastName:'v1'},
{firstName:'s2',lastName:'v2'},
{firstName:'s3',lastName:'v3'}]
newJson = oldJson.map(rec => {
return {
'Last Name': rec.lastName,
'First Name': rec.firstName,
}
})
output: [{Last Name:"v1",First Name:"s1"},
{Last Name:"v2",First Name:"s2"},
{Last Name:"v3",First Name:"s3"}]
最好有一个新的数组