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[英]Getting max and min value from array of objects and returning another value associated with the same object. JavaScript
[英]Swapping an Objects value, with a value from another object. *Javascript*
我的任務是編寫一個函數,該函數將元素的值與第二個對象內同一位置的值交換。
{placeOne:10,placeTwo:20},{ten:"firstPlace",twenty:"secondPlace"}
{placeOne:"firstPlace",placeTwo:"secondPlace"},{ten:10,twenty:20} // should equal this
我想嘗試一種將對象值推入數組的方法,然后遍歷對象並將每個位置設置為數組內的位置。
但是我無法同時遍歷對象和數組,因此無法以這種方式解決。
這是我到目前為止所擁有的。
function swapObj(obj1,obj2){
let obj1Arr = [];
let obj2Arr = [];
for(var i in obj1) {
obj1Arr.push(obj1[i]);
}
for(var k in obj2) {
obj2Arr.push(obj2[k])
}
swapObj({placeOne:10,placeTwo:20,placeThree:30,},
{ten:"firstPlace",twenty:"secondPlace",thirty:"thirdPlace"}
)
如果我正確理解了您的問題,則應該這樣做(每個步驟都用注釋說明):
const swapValues = (a, b) => {
// obtain arrays of entries ([key, value] pairs) of input objects
// assuming the entries come in insertion order,
// which is true in practice for all major JS engines
const entriesA = Object.entries(a)
const entriesB = Object.entries(b)
// output is a pair of objects:
// first with keys from a, but values from b
// at corresponding entry indices
// second with keys from b, but values from a
// at corresponding entry indices
// assuming both objects have the same number of entries
// (might want to check that)
return entriesA.reduce(
// for each entry from a with keyA, valueA and index
(acc, [keyA, valueA], index) => {
// get corresponding entry from b
const entryB = entriesB[index]
// with keyB and valueB
const [keyB, valueB] = entryB
// put valueB at keyA in the first output object
acc[0][keyA] = valueB
// put valueA at keyB in the second output object
acc[1][keyB] = valueA
return acc
},
// initially the output objects are empty:
[{}, {}]
)
}
console.log(swapValues(
{placeOne: 10, placeTwo: 20},
{ten: "a", twenty: "b"}
)) // -> [ { placeOne: 'a', placeTwo: 'b' }, { ten: 10, twenty: 20 } ]
您可能要使其適應您的JS版本。 請注意,輸入對象沒有發生變化-您將獲得兩個全新的對象(如果輸入對象具有嵌套對象作為值,則可能與您的輸入對象共享某些結構)。
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