I'm having problems with looping through an array. I'm making an RPG bot for Discord, and I need to display the inventory
of the player when prompted. I've tried to use Object.values()
, Object.map()
and Object.entries()
. The names of the items
are already worked out with Object.keys(inventory)
, but the values
are the problem.
var invItems = Object.keys(inventory);
var InvValues = Object.entries(inventory);
for (var i = 0; i <= invItems.length; i += 1) {
if (invValues[i[1]] > 0) {
message.channel.send(`${invValues[i[1]]}x ${invItems[i]}`);
}
};
I'm a beginning coder, so please explain more detailed than you usually may do.
You can send values to message.channel
directly using for...of
loop like:
for (let [key, value] of Object.entries(inventory)) {
if (value > 0) {
message.channel.send(`${value}x ${key}`);
}
}
Explanation:
The Object.entries()
method returns an array of a given object's own enumerable string-keyed property [key, value] pairs. So, when we use it like:
const object1 = { a: 'somestring', b: 42 }; console.log(Object.entries(object1));
You can we get get an array back and each inside array is another array of key-value pair. Now, we can get each key & value using array destructuring and for...of
loop like:
const object1 = { a: 'somestring', b: 42 }; for (let [key, value] of Object.entries(object1)) { console.log(`${key}: ${value}`); } // Returns: // "a: somestring" // "b: 42"
You can see this now returns all the keys and values properly. We have to just modify it a little bit to match your requirement and send the required message back.
var invItems = Object.keys(inventory);
var invValues = Object.entries(inventory); // fixed the capital i
for (var i = 0; i <= invItems.length; i += 1) {
if (invValues[i] > 0) {
message.channel.send(`${invValues[i]}x ${invItems[i]}`);
}
};
You are not using i
as an index rather you are trying to access i[1]
as if it were an array
also, in Javascript, you can also do a JSON.stringify
to see the object structure. this will print your inventory
to a JSON String
.
//this may help you see what the inventory looks like
for(let i = 0; i<inventory.length; i+=1)
console.log(JSON.stringify(inventory[i]));
You are on the right track with Object.entries
which will provide an array of key/value pair arrays. Note that here: invValues[i[1]]
you are trying to access a property 1
of i
with is probably undefined
. You can actually avoid some complication if you iterate with forEach
here.
const inventory = { itemA: 'description for A', itemB: 'description for B' } Object.entries(inventory).forEach(([key, value]) => { // replace with message.channel.send(...) console.log(`${key}: ${value}`) })
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.