const obj = {
lang1: 'javascript',
lang2: 'c',
lang3: 'python',
};
const lastKey = Object.keys(obj).pop();
console.log("last key: " + lastKey);
const lastValue = Object.values(obj).pop();
console.log("last value: " + lastValue);
console.log(obj);
/*
run:
"last key: lang3"
"last value: python"
{
lang1: "javascript",
lang2: "c",
lang3: "python"
}
*/