[英]Filter Object property based on array with order of array
I have an array我有一个数组
const arr = ['a', 'b', 'd', 'c', 'e'];
The API sends this data API 发送此数据
const data ={a:'a', b:'b', c:'c', e:'e', f:'f'}
sometimes the keys are missing as well but the array keys should always be present in the final result.有时键也会丢失,但数组键应始终存在于最终结果中。
the output should be {a:'a', b:'b', d:'', c:'c', e:'e'}
. output 应该是{a:'a', b:'b', d:'', c:'c', e:'e'}
。 Please help me with ES6 and give me an explanation.请帮助我使用 ES6 并给我一个解释。 I am using reactjs16.9.我正在使用 reactjs16.9。 In this given case the object d is missing hence it should be initialised with "".在这个给定的情况下,object d 缺失,因此它应该用“”初始化。 In case If all the keys exist then extra keys from API should be removed.如果所有密钥都存在,则应删除 API 中的额外密钥。
You could iterate the keys and build a new object by using only wanted keys.您可以只使用想要的密钥来迭代密钥并构建新的 object。
Inside of the callback for mapping, the existence of the key is checked with the in
operator and a conditional (ternary) operator ?:
is used for getting either the value from the object or a placeholder ' '
for unknown properties.在映射回调内部,使用in
运算符和条件(三元)运算符?:
检查键是否存在,用于从 object 或占位符' '
获取未知属性的值。
The result is either an object with Object.fromEntries
or a simple array.结果是带有 Object.fromEntries 的Object.fromEntries
或简单数组。
const keys = ['a', 'b', 'd', 'c', 'e'], data = {a: 'a', b: 'b', c: 'c', e: 'e', f: 'f' }, result = Object.fromEntries(keys.map(k => [k, k in data? data[k]: ' '])), onlyValues = keys.map(k => k in data? data[k]: ' '); console.log(result); console.log(onlyValues);
.as-console-wrapper { max-height: 100%;important: top; 0; }
Perhaps this?也许这个?
Using ||使用 || to use space if no entry available如果没有可用的条目,则使用空间
const arr = ['a', 'b', 'd', 'c', 'e']; const data = {a:'a', b:'b', c:'c', e:'e', f:'f'}; let newObj = {}; let newArr = []; arr.forEach(item => { newObj[item] = data[item] || " "; newArr.push( data[item] || " "); }) console.log(newObj); console.log(newArr);
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