How do i convert this:
{one:1,two:2,three:3,four:4}
to this:
{1:'one',2:'two',3:'tree',4:'four'}
I tried this :
Array.prototype.reverse.call({1:'one', 2:'two', 3:'tree',4:'four' length:5});
but this reverses the whole thing , which i dont want. Any one has any suggestions?
You could use a for... in loop to do this, assigning the key at each property to the value in the resulting object.
let o = {one:1,two:2,three:3,four:4};
let result = {};
for(let key in o) {
result[o[key]] = key;
}
console.log('Result:', result).as-console-wrapper { max-height: 100% !important; top: 0; }You could also use Array.reduce along with Object.entries() to get the result you wish:
let o = {one:1,two:2,three:3,four:4};
let result = Object.entries(o).reduce((acc, [key,value]) => {
return { ...acc, [value]: key };
}, {});
console.log('Result:', result).as-console-wrapper { max-height: 100% !important; top: 0; }You can use Object.entries() to get key/value pairs into an array, and then .reduce() to construct a new object:
function invertObject(obj) {
return Object.entries(obj).reduce(function(newObj, pair) {
newObj[pair[1]] = pair[0];
return newObj;
}, {});
}
You can combine Object.fromEntries() with Object.entries() and Array.prototype.map to reverse the key value pairs.
const obj = {one:1,two:2,three:3,four:4};
const reverseObj = Object.fromEntries(Object.entries(obj).map(([key, value]) => [value, key]));
console.log(reverseObj);