Question

JavaScript

Write a function named "reverse_kvs" that has a key-value store as a parameter and returns a new key-value store. Your function should add each key-value pair in the parameter to the new key-value store EXCEPT reversing the key and value. For example, if the key-value "extreme":45 were in the parameter then the returned key-value store should contain the key-value pair 45:"extreme".

The following code doesn't work:

function reverse_kvs(d) {
    var new_d = {};
    for (var k in d) {
        new_d[d[k]] = k;
    }
    return new_d;
}

Error message:

returned: {}

expected: {33: 'particle', 75: 'fear', -36: 'champion'}

Answer 1

const d = {"particle":33, "fear":75, "champion":-33}
       function reverse_kvs(d)
       {
           const keys = Object.keys(d);
           const new_d = {};
           for (const key of keys) {
              new_d[d[key]] = key;
           }
           return new_d;
       }
       console.log(reverse_kvs(d));

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