I need to complete the keysAndValues function so that it takes an object and returns the keys and values as separate arrays. For example:
keysAndValues({k: 11, l: 12, m: 13}) // should return [['k', 'l', 'm'], [11, 12, 13]]
I have already tried: http://jsfiddle.net/marcusdei/ppfh5fpa/4/
Try this
function keysAndValues(data){
var keys = Object.keys(data),
values = keys.map(function (key) {
return data[key];
});
return [keys, values];
}
console.log(keysAndValues({k: 11, l: 12, m: 13}));
Object.keys- The Object.keys() method returns an array of a given object's own enumerable properties
.map- The map() method creates a new array with the results of calling a provided function on every element in this array.
Update
There is new method .values which was added to Object,
function keysAndValues(data){
return [Object.keys(data), Object.values(data)];
}
console.log(keysAndValues({k: 11, l: 12, m: 13}));
Object.values- the method returns an array of a given object's own enumerable property values, in the same order as that provided by afor...inloop
Try:
function keyValues(obj, keys){
return [keys = Object.keys(obj), keys.map(function(k){return obj[k]})]
}
var result = keyValues({k: 11, l: 12, m: 13});
document.write(JSON.stringify(result))
keys would be undefined.function keysAndValues(obj) {
var keys = [];
var value = [];
for (key in obj) {
keys.push(key);
value.push(obj[key]);
}
return [keys,value]
}
console.log(keysAndValues({
k: 11,
l: 12,
m: 13
}));The old-fashioned way, defining two arrays and pushing the keys and values into them.
function keysAndValues(obj) {
var keys = [], values = [];
for (var p in obj) {
keys.push(p);
values.push(obj[p]);
}
return [keys, values];
}
Object.entries gets you halfway there, returning an array of key-value` pairs.
Example:
obj = { k: 11, l: 12, m: 13 }
Object.entries(obj); // [["k", 11], ["l", 12], ["m", 13]]
From here you can reduce this array into separate arrays by pushing the keys into one array and the values into the other.
const keysAndValues = (obj) =>
Object.entries(obj).reduce(
([keys, values], [key, value]) => [keys.concat(key), values.concat(value)],
[[], []]
);
const res = keysAndValues({ k: 11, l: 12, m: 13 });
console.log(JSON.stringify(res)); // [["k", "l", "m"], [11, 12, 13]]