[英]What is the best way to check if an object is an array or not in Javascript?
[英]Javascript Array to Object best way
我有以下
{
bill: [
{ satisfy: 'true', comments: '' }
],
permission_title: [
{ satisfy: 'false', comments: '5' }
],
final_status: [
{ satisfy: 'true', comments: '' }
]
}
我需要发送:
{
bill: { satisfy: 'true', comments: '' },
permission_title: { satisfy: 'false', comments: '5' },
final_status: { satisfy: 'true', comments: '' }
}
最快,最快的方法是什么?
使用Object.entries()
提取键/值对(条目Object.entries()
。 使用Array.map()
迭代条目。 对于每个条目,返回一个带有键的对象,以及一个没有包装数组的值。 通过传播到Object.assign()
合并回一个对象:
const obj = {"bill":[{"satisfy":"true","comments":""}],"permission_title":[{"satisfy":"false","comments":"5"}],"final_status":[{"satisfy":"true","comments":""}]}; const result = Object.assign( ...Object.entries(obj).map(([k, v]) => ({ [k]: v[0] })) ); console.log(result);
假设您的对象名为obj 。 我会这样:
for(var p in obj) obj[p] = obj[p][0];
const obj={ bill: [ { satisfy: 'true', comments: '' } ], permission_title: [ { satisfy: 'false', comments: '5' } ], final_status: [ { satisfy: 'true', comments: '' } ] } let obj_new=Object.assign(obj); for(var p in obj_new) { obj_new[p] = obj_new[p][0] }; console.log(obj_new);
假设每个值只有一个索引,另一种方法是使用函数reduce
和Object.keys
函数。
var obj = { bill: [{ satisfy: 'true', comments: '' }], permission_title: [{ satisfy: 'false', comments: '5' }], final_status: [{ satisfy: 'true', comments: '' }]}, result = Object.keys(obj).reduce((a, k) => (Object.assign(a, {[k]: obj[k][0]})), {}); console.log(result);
.as-console-wrapper { max-height: 100% !important; top: 0; }
const src = { bill: [ { satisfy: 'true', comments: '' } ], permission_title: [ { satisfy: 'false', comments: '5' } ], final_status: [ { satisfy: 'true', comments: '' } ] }; const dest = Object.keys(src).reduce((prev, key) => { prev[key] = src[key][0]; return prev; }, {}); console.log(dest);
我不确定效率是明智的,但是您也可以使用find函数!
const src = { bill: [ { satisfy: 'true', comments: '' } ], permission_title: [ { satisfy: 'false', comments: '5' } ], final_status: [ { satisfy: 'true', comments: '' } ] }; const dest = Object.keys(src).reduce((prev, key) => { if(Array.isArray(src[key])) { prev[key] = src[key].find(() => true); } return prev; }, {}); console.log(dest);
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