My issue is that when i call the function getAllFlashCardsFromQuest(), its call all flash cards ever created in all the pages, i wanna only the objects that comes from a specific pathname, or a way to filter the cards array.
async function getCards() {
let cardsValues = await getAllFlashCardsFromQuest() as FlashCard[]
let cardsFiltered = cardsValues.filter(()=>{
return history.location.pathname === 'CriarAlternativaQuest'
})
console.log(cardsFiltered)
setCards(cardsFiltered)
}
the object look like this:
There's not much context with your code, so I can only help so much, but one thing's for sure, and that is history.location.pathname isn't changing and you're comparing it with another constant. So cardsFiltered will be either a list of true or a list of false.
Whenever you're filtering a list, you need to take each item or a property of each item and use that in your comparison.
Ex.
async function getCards() {
let cardsValues = await getAllFlashCardsFromQuest() as FlashCard[]
let cardsFiltered = cardsValues.filter((cardValueItem) => {
return cardValueItem.pathname === 'CriarAlternativaQuest'
})
}
The thing is that you need to figure out what value or property inside of your cardsValues list that you need to compare it with 'CriarAlternativaQuest'
Related
setListOfPosts(curPosts => {
let newPosts = [...curPosts];
newPosts[newPosts.findIndex(p => p.id === postId)].alert = response.data;
}
});
//is curPosts an instance of array or complete array?? my listofPosts is an array of objects
Your setState call needs to return newPosts, and you're creating an array using the spread operator which is why it's coming back as an array of objects.
I'm not sure what your desired output is, but by adding a return function it will set the state:
setListOfPosts(curPosts => {
let newPosts = [...curPosts];
newPosts[newPosts.findIndex(p => p.id === postId)].alert = response.data;
return newPosts
}
});
This is untested but if your logic is correct should return an array of objects with the objects alert value updated.
Another option would be to do your logic before your setState call, by creating a a newState array and then simply updating the state with that new array without the use of the callback.
The callback function is useful if you want to add a new object to state array or do something that preserves the initial state, in your example you could do it without the callback like this:
// Create a copy of the state array that you can manipulate
const newPosts = [...newPosts]
if (data.response) {
// Add your logic to the state copy
newPosts[newPosts.findIndex(p => p.id === postId)].alert = response.data;
// Replace state with state copy
setListOfPosts(newPosts)
}
Again untested but hopefully this should help you understand the use of the callback function and the right way to use it.
i currently have an object and inside this object i have multiple objects and Arrays. I want replace an Array inside this object with a new Array, so i thought of making a copy of the entire object and simple replace the Array i wan to change with the updated Array. My problem is i couldnt complete my code, i have the idea of how to do it but cant execute it.
setListings(listings=>
listings.map(item =>{
if(item.id === msg.id){
//console.log(item)
//console.log(item.Message)
const newMessages = [msg,...item.Messages]
//console.log(newMessages)
return console.log([msg,...item.Messages],{...item}) // just for testing purpose i
am returning a console log
to see what it will get me. Not correct.
}
return item;
})
);
So basically listings is my state variable, here console.log(item) prints out the entire object, console.log(item.Messages) prints out the current Messages Array which i want to replace, console.log(newMessages) prints out the new Messages Array which i want to replace the current Messages array with.
cartItem.map((food,index)=> {
if(food.food_id == newFoodItem.food_id && food.id == newFoodItem.id){
const AllFoodData = cartItem
AllFoodData[index] = newFoodItem
AsyncStorage.setItem('#Add_cart_Item', JSON.stringify(AllFoodData))
.then(() => {})
.catch(err => console.log(err))
ToastAndroid.showWithGravityAndOffset('Cart Replace Successfully',ToastAndroid.LONG,ToastAndroid.BOTTOM,25,50 )
}
})
So basically what i want to achieve here is to add the msg object to the existing Messages Array.
Since lsitings is an Array of objects using the .map i can spread through each object and check if the id of that object is each to my msg.id. if that is true then i want to return a copy the that specific listing and edit the Messages Array within [msg, ...item.Messages] otherwise return the existing item.
setListings(listings=> listings.map(item => {
if(item.id === msg.id) {
return {
...item,
Messages: [msg, ...item.Messages]
}
}
return item;
}));
});
I am having a really hard time solving this issue I'm currently having. You see, I am using Firebase as my database to store and fetch data.
Right now, I want to be able to return an array that is being made inside a Firebase .once call, but I am having some difficulties. This is my code so far:
Calling the function (a return function):
<p>{this.fetchStartingPrice(singleProduct.id)}</p>
This is where I want to display the specific value, that I am trying to fetch down below:
fetchStartingPrice(category){
let promises = [];
promises.push(this.fetchPrices(category));
Promise.all(promises).then(result => {
console.log(result);
})
}
I have just used a console.log in an attempt to troubleshoot errors.
fetchPrices(category){
var allPrices = [];
allProductsFirebase.child(category).once('value', (snapshot) => {
snapshot.forEach((childSnapshot) => {
if(childSnapshot.key == category){
allPrices.append(childSnapshot.val().brand);
}
});
return allPrices;
})
}
So basically, I want to loop through the allProductsFirebase in an attempt to first identify the brand of the product, and if it matches with the brand that has been used as a parameter in fetchStartingPrice() and fetchPrises(), I want to store the specific price of that product in an array of numbers (prices). After I have looped through the whole snapshot, I want to return the full array containing only product prices, and then through fetchStartingPrice(), I want to use Math.min(promises) to grab the lowest number in that array. However, I am having a really hard time doing this. Could someone please help me with this?
I want to be able to then, after all of this, return the value in fetchStartingPrice().
fetchPrices() must return Promise or be Promise. you are returning nothing from fetchPrices() ( you are returning allPrices in the .once() scope ). try to return the result ( if it returns Promise ) that .once() returns.
fetchPrices(category){
var allPrices = [];
return allProductsFirebase.child(category).once('value', (snapshot) => {
snapshot.forEach((childSnapshot) => {
if(childSnapshot.key == category){
allPrices.append(childSnapshot.val().brand);
}
});
return allPrices;
})
}
superagent.get(URL).then((res) => {
for(let i in res.body) {
if (i==='has_rejected_advisories') {
console.log(i + "="+res.body[i]);
}
}
})
.catch((err) => err.message));
My result is:
has_rejected_advisories=false
But I am not able to use res.body[i] outside this function, i.e I want superagent function to return this value in a boolean variable to use it elsewhere.
ex.
a = superagent.get(URL).then((res) => {
for(let i in res.body) {
if(i==='has_rejected_advisories') {
console.log(i + "="+res.body[i]);
}
}
})
.catch((err) => err.message));
if(a===false){/*do this*/}
This is because the superagent.get(url) call is asynchronous. The value given to a is a Promise
Since this is async, the if (a === false) is actually executing before the function body passed to .then. You will either need to move this logic to the .then function, or use something like async/await if you like the synchronous looking syntax.
On top of jerelmiller's great advice you need to note the following:
Try this:
create a global var assuming it's a string
var mysares = ""
This example will only bring back 1 string back of everything!! Not single element. Also if you can't get the standard Fetch() to work don't try other methods like axios or superagents. Now use our global like so:
superagent.get(URL).then((res) => {
for(let i in res.body) {
if (i==='has_rejected_advisories') {
//Add comments as will help you
//to explain to yourself and others
//what you're trying to do
//That said if this iteration produces
//correct data then you're fine
//push my result as a string
mysares = res.body[i];
//infact what's in row 1?
mysares = res.body[0];
//Actually I code my own JSON!!
mysares = res.body[1];
console.log(i + "="+mysares);
}
}
})
.catch((err) => err.message));
Now you can do whatever:
if(mysares===false){/*do this*/
alert(playDuckHunt());}
Things to note:
res.body[i] is an iteration
You cannot use it outside of the function
Because:
It's local to that function
You don't know what position of 'i' is even if you could use it as you will be outside of your loop
One last thing:
Loops loop through loops or arrays etc.
So (in real world) you can't just request the value of the loop
unless you agree the position of data to be released,
type,and bucket (where it's going to be displayed or not).
Hope this helps!
PS> we need to know where 'has_rejected_advisories' is in the JSON so send us your json url as it must be a column/obj header name. Or it's any old 'a' then var a can be your "false"
In constructor:
this.state = {a:null};
In some function:
superagent.get(URL).then(
(res) => {for(let i in res.body)
{
if(i === 'has_rejected_advisories')
{
this.setState({a:res.body[i]})
}
}
}).catch((err)=>(err.message));
In render:
console.log(this.state.a);
Inside then() the value could be used using state variable but there are many scenarios we could not use them, like if we want to perform all the operations under constructor i.e Initializing state variable, calling superagent and changing the state variable and using the state variable.
In one component I can filter my array using the following:
// Array of product objects
const result = products.filter(p => p.name.includes('val'));
and value of products remains same as the first value but filtered value stores in result.
But in the following code, filter() filters array of strings itself:
// Array of strings
const result = strs.filter(s => s.includes('val'));
The question is how can I filter strings and return result without modifying the strs itself?
Note: I tried with array.filter(function() { return res; }); but didn't make any change.
It returns the filtered ones and don't change the actual array. You are doing something wrong
const strs = ['valval', 'bal', 'gal', 'dalval'];
const result = strs.filter(s => s.includes('val'));
console.log(strs);
console.log(result);
First thing we need to know is, if we filter our list we loose our original data
products: any[] = [
{
"productId": 1,
"productName": "foo-bar",
"price": 32.99
}
]
and can't get it back without re-getting the data from it's source so we have to make another list to store the filtered list.
filteredProduce: any[];
Next if you are working to show a list of filtered product on a grid or something like this we need a way to know when the user changes the filter criteria. we could use event binding and watch for key presses or value changes, but an easier way is to change our _listFilter property into a getter and setter, like this
get listFilter: string {
return this._listFilter;
}
set listFilter(value:string) {
this._listFilter= value;
}
next we want to set our filteredProducts array to the filtered list of products like this
set listFilter(value:string) {
this._listFilter= value;
this.filteredProducts = this._listFilter? this.performFilter(this._listFilter) : this.products;
}
in preceding code we are using js conditional operator to handle the posibility that _listFilterstring is empty, null or undefined.
Next we use this.performFilter(this._listFilter) to filter our list.
performFilter(filterBy: string): any[] {
filterBy = filterBy.toLocaleLowerCase();
return this.products.filter((product: any) =>
product.productName.toLocaleLowerCase().indexOf(filterBy) !== -1);
}
Finally we should assign the main list of products to the filteredProducts and _listFilter to what we want.
constructor() {
this.filteredProducts = this.products;
this._listFilter= 'foo-bar';
}
last step is to change our template to bind to our filteredProducts property.