【每日一题】- 2020-08-10 - JS 编程题

[azl397985856]

// Write a function that takes an object as argument // Somehow, the properties and keys of the object got mixed up // Swap the Javascript object's key with its values and return the resulting array // Tipp: although usually not relevant, mind the order of the properties in the test case outputs

function myFunction(ns) {

}

test case:

myFunction({ bear: 'animal', sow: 'female', boar: 'male', cub: 'young' }) 
Expected
{ young: 'cub', male: 'boar', female: 'sow', animal: 'bear' } 

myFunction({ sheep: 'animal', ewe: 'female', ram: 'male', lamb: 'young' }) 
Expected

{ young: 'lamb', male: 'ram', female: 'ewe', animal: 'sheep' } 
myFunction({ whale: 'animal', cow: 'female', bull: 'male', calf: 'young' }) 

Expected
{ young: 'calf', male: 'bull', female: 'cow', animal: 'whale' } 

你可以去 https://www.jschallenger.com/javascript-objects/swap-object-keys-values/challenge?id=5f1043abbd87ab5028fee12e 在线检查自己的答案。

[azl397985856]

My Accepted One Line Solution With Entries API

Code

function myFunction(ns) {
  return Object.fromEntries(Object.entries(ns).reverse().map(entry => entry.reverse()))
}

[suukii]

const myFunction = obj => {
    const res = {};
    const entries = Object.entries(obj).reverse();
    for (const [key, value] of entries) {
        res[value] = key;
    }
    return res;
};

[lxhguard]

function myFunction(ns) {
  const keys = Object.keys(ns);
  const values = Object.values(ns);
  const obj = {};
  for(let i = values.length - 1; i >= 0; i--){
     obj[values[i]] = keys[i];
  }
  return obj;
}

[stale[bot]]

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