Lodash utils a la`mapArrayToObj`和它的反向？

Question

我一堆效用函數的我把整個項目重新創建這個樣子：

export function objectToArray(obj){ 
    return Object.keys(obj).map(key => obj[key]); 
} 

export function mapArrayToObj(arr) { 
    return addArrayToObj({}, arr); 
} 

export function addArrayToObj(obj, arr) { 
    arr.forEach((elem) => obj[elem._id] = elem); // '_id' would be a param 
    return obj; 
} 

export function patchExisting(existingEntitiesDict, newEntitiesDict) { 
    return Object.assign(existingEntitiesDict, newEntitiesDict); 
} 

這實質上有些與normalizr重疊的，但我想知道是否有在lodash一些功能，我可以用它代替重新創建這些映射函數。

Answer 1

以下是lodash（或ES6）當量

objectToArray(obj) - > lodash _.values()或ES6 Object.values(obj)

mapArrayToObj(arr) - > lodash _.keyBy(arr, 'id')

addArrayToObj(obj, arr) - > lodash _.assign(obj, _.keyBy(arr, 'id'))

patchExisting(existingEntitiesDict, newEntitiesDict) - > lodash的_.assign(existingEntitiesDict, newEntitiesDict)