从对象数组中选取值并创建一个新对象：Javascript

Question

I have an array of objects of the format:

input = [ 
  { key : "Test1", value: 25, total: 100},
  { key : "Test2", value: 35, total: 200},
  { key : "Test3", value: 45, total: 300},
  { key : "Test4", value: 55, total: 400},
  { key : "Test5", value: 65, total: 500}
]

I basically have to fetch some properties out of this and form a new array that should look something like this. text is equivalent to its text representation that is maintained in a separate object.

textObj = { "Test1" : "Test1Eq" , "Test2" : "Test2Eq" , "Test3" : "Test3Eq" , "Test4" : "Test4Eq" , "Test5" : "Test6Eq" }

I just have to fetch count of Text1, Text4, Text 5 and return its text equivalent and its count in a new array.

Result

output = [ 
  { text : "Test1Eq", count: 25},
  { text : "Test4Eq", count: 55},
  { text : "Test5Eq", count: 65}
]

Method I tried

const res = input.map(item=>{
      return{
        text :textObj[item.key],
        count: item.count
      }
});

Answer 1

To find the count, you can use array#find .

 const input = [ { key: "Test1", value: 25, total: 100}, { key: "Test2", value: 35, total: 200}, { key: "Test3", value: 45, total: 300}, { key: "Test4", value: 55, total: 400}, { key: "Test5", value: 65, total: 500} ], textObj = { "Test1": "Test1Eq", "Test2": "Test2Eq", "Test3": "Test3Eq", "Test4": "Test4Eq", "Test5": "Test6Eq" }, keys = ['Test1', 'Test4', 'Test5'], result = keys.map(key => ({ text: textObj[key], count: input.find(o => o.key === key)?.value })); console.log(result);