I want validate a field with vue js validations that can not be in specific values
exemple : array = ['apple','banana']
I want that fruit data can't be in array
any suggestions?
How about:
let array1 = ['apple','banana'];
let array2 = ['apple','orange'];
let fruit = 'banana';
let isValid1 = !array1.includes(fruit);
let isValid2 = !array2.includes(fruit);
console.log(isValid1); // false
console.log(isValid2); // true
Here is a bit more on includes works:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes
Related
I struggle accessing the row-elements of a Frame.
One idea I have is to filter the dataframe down to a row, convert it to a vec or something similar and access the elements this way ?!
In Panadas I used to just use ".at / .loc / .iloc / etc."; with Polars in Rust I have no clue.
Any suggestions on what the proper way to do this is ?
Thanks to #isaactfa ... he got me onto the right track. I ended up getting the row not with "get_row" but rather with "get" ... this is probably due to my little RUST understanding (my 2nd week).
Here is a working code sample:
use polars::export::arrow::temporal_conversions::date32_to_date;
use polars::prelude::*;
fn main() -> Result<()> {
let days = df!(
"date_string" => &["1900-01-01", "1900-01-02", "1900-01-03", "1900-01-04", "1900-01-05",
"1900-01-06", "1900-01-07", "1900-01-09", "1900-01-10"])?;
let options = StrpTimeOptions {
date_dtype: DataType::Date, // the result column-datatype
fmt: Some("%Y-%m-%d".into()), // the source format of the date-string
strict: false,
exact: true,
};
// convert date_string into dtype(date) and put into new column "date_type"
// we convert the days DataFrame to a LazyFrame ...
// because in my real-world example I am getting a LazyFrame
let mut new_days_lf = days.lazy().with_column(
col("date_string")
.alias("date_type")
.str()
.strptime(options),
);
// Getting the weekday as a number:
// This is what I wanted to do ... but I get a string result .. need u32
// let o = GetOutput::from_type(DataType::Date);
// new_days_lf = new_days_lf.with_column(
// col("date_type")
// .alias("weekday_number")
// .map(|x| Ok(x.strftime("%w").unwrap()), o.clone()),
// );
// This is the convoluted workaround for getting the weekday as a number
let o = GetOutput::from_type(DataType::Date);
new_days_lf = new_days_lf.with_column(col("date_type").alias("weekday_number").map(
|x| {
Ok(x.date()
.unwrap()
.clone()
.into_iter()
.map(|opt_name: Option<i32>| {
opt_name.map(|datum: i32| {
// println!("{:?}", datum);
date32_to_date(datum)
.format("%w")
.to_string()
.parse::<u32>()
.unwrap()
})
})
.collect::<UInt32Chunked>()
.into_series())
},
o,
));
new_days_lf = new_days_lf.with_column(
col("weekday_number")
.shift_and_fill(-1, 9999)
.alias("next_weekday_number"),
);
// now we convert the LazyFrame into a normal DataFrame for further processing:
let mut new_days_df = new_days_lf.collect()?;
// convert the column to a series
// to get a column by name we need to collect the LazyFrame into a normal DataFrame
let col1 = new_days_df.column("weekday_number")?;
// convert the column to a series
let col2 = new_days_df.column("next_weekday_number")?;
// now I can use series-arithmetics
let diff = col2 - col1;
// create a bool column based on "element == 2"
// add bool column to DataFrame
new_days_df.replace_or_add("weekday diff eq(2)", diff.equal(2)?.into_series());
// could not figure out how to filter the eager frame ...
let result = new_days_df
.lazy()
.filter(col("weekday diff eq(2)").eq(true))
.collect()
.unwrap();
// could not figure out how to access ROW elements
// thus I used "get" instead af of "get_row"
// getting the date where diff is == 2 (true)
let filtered_row = result.get(0).unwrap();
// within the filtered_row get element with an index
let date = filtered_row.get(0).unwrap();
println!("\n{:?}", date);
Ok(())
}
I love lodash and I use it in many projects.
I always have this problem and I can't find a solution for it.
I would like to do something with lodash, save a temporary state, and continue.
For example lets assume I have moviesList which is a list of movies with their id and profit, and I want to
index movies by their id and keep the result in moviesById
filter profitable movies and keep the result in overMillionProfit
And I want to do so without breaking the chain.
Something like (wishful thinking):
var moviesList = [{id : 1}, {id:2}, ...];
var moviesById = {};
var overMillionProfit = [];
_(moviesList)
.keyBy('id')
.do((unwrappedValue)=> moviesById = unwrappedValue)
.values()
.filter( (m) => m.profit > 1000000)
.do((unwrappedValue) => overMillionProfit = unwrappedValue)
Currently, I find it necessary to break the chain like so:
var moviesList = [{id : 1}, {id:2}, ...];
var moviesById = _.keyBy(moviesList,'id');
var overMillionProfit = _.filter(moviesList, ...);
Perhaps for this scenario it is better, but I want to be able to do it like the above in some cases.
Is there a way to do this?
You can use _.tap() for that:
var moviesList = [{id : 1}, {id:2}, {id:3}];
var moviesById;
var overMillionProfit;
var result = _(moviesList)
.keyBy('id')
.tap((unwrappedValue)=> moviesById = unwrappedValue)
.values()
.filter( (m) => m.id > 1)
.tap((unwrappedValue) => overMillionProfit = unwrappedValue)
.value();
console.log('moviesById\n', moviesById);
console.log('overMillionProfit\n', overMillionProfit);
console.log('result\n', result);
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>
"first part" &&&& fun _ ->
let ident
"second part" &&&& fun _ ->
ident ....
I need to use variable "ident".
I just need to pass value of variable from first part of test to second one...
I want to ask you if there is any easy way how to define and use global variable or even if you have better (and easy) idea of doing that
Keep in mind, please, that I am a beginner, so I would prefer easier ones.
Global variables will often make your code difficult to work with - particularly if they are mutable.
Instead, consider returning the values you need to keep track of as composite values. An easy data type to start with would be a tuple:
let ``first part`` id =
let someOtherValue = "Foo"
someOtherValue, id + 1
This function takes an int (the current ID) as input, and returns string * int (a tuple where the first element is a string, and the second element and int) as output.
You can call it like this:
> let other, newId = ``first part`` 42;;
val other : string = "Foo"
val newId : int = 43
Notice that you can use pattern matching to immediately destructure the values into two named symbols: other and newId.
Your second function could also take an ID as input:
let ``second part`` id otherArgument =
// use id here, if you need it
"Bar"
You can call it like this, with the newId value from above:
> let result = ``second part`` newId "Baz";;
val result : string = "Bar"
If you find yourself doing this a lot, you can define a record for the purpose:
type Identifiable<'a> = { Id : int; Value : 'a }
Now you can begin to define higher-order functions to deal with such a type, such as e.g. a map function:
module Identifiable =
let map f x = { Id = x.Id; Value = f x.Value }
// Other functions go here...
This is a function that maps the Value of an Identifiable from one value to another, but preserves the identity.
Here's a simple example of using it:
> let original = { Id = 42; Value = "1337" };;
val original : Identifiable<string> = {Id = 42;
Value = "1337";}
> let result' = original |> Identifiable.map System.Int32.Parse;;
val result' : Identifiable<int> = {Id = 42;
Value = 1337;}
As you can see, it preserves the value 42, but changes the Value from a string to an int.
You can still change the ID explicitly, if you want to do that:
> let result'' = { result' with Id = 7 };;
val result'' : Identifiable<int> = {Id = 7;
Value = 1337;}
Since this was getting out of hand for comments this is how I would do it for an example
let mutable t = 0
let first =
t <- 1 + 1
//other stuff
let second =
//can use t here and it will have a value of 2
In some cases you have to use a ref:
let t = ref 0
let first =
t := 1 + 1
//other stuff
let second =
//can use t here and it will have a value of 2 -
// you use "!t" to get the value
If you define ident at the top of your file like this :
let ident = "foo"
// rest of your code using ident
ident are global and you can use in the next part of your file.
EDIT :
If ident wil change in the next part of your code, use this :
let ident = ref "foo"
jsonStoreInit = function(pSuccess, pFailure){
collections={};
collections['objects'] = {};
var options = {};
options.localKeyGen = false;
options.clear = false;
options.username = app.username;
options.password = app.password;
options.additionalSearchFields = {key: 'string'};
WL.JSONStore.init(collections, options)
.then(pSuccess)
.fail(pFailure);
};
putObject = function(pObject) {
var keyValue = pObject.getKey();
var object = {myObject : pObject.getKey()};
var options = {};
//options.additionalSearchFields = {key : keyValue};
WL.JSONStore.get("objects")
.add(object, options);
};
I'm on WL 6.0 FP 1
In the code sample above jsonStoreInit is what I use to init my store including the options.additionalSearchFields.
When I come to add the objects in the putObject funciton it works fine with the additionalSearchFields commented out, but when I uncomment it to add the additional fields I get an error
[wl.jsonstore] {"src":"store","err":21,"msg":"INVALID_ADD_INDEX_KEY","col":"objects","usr":"xxxx","doc":{},"res":{}}
When I look this error message up all I get is
21 INVALID_ADD_INDEX_KEY
Problem with additional search fields.
Which I had kinda figured ... can anyone provide any help on this ...
I don't need to you fix my code but if you could point me to a working example that would be excellent.
Many thanks, ownimage
The person that asked the question solved it, but I'm leaving this answer in case someone is wondering how to pass data that uses additionalSearchFields.
Example:
var data = {hello: 'world'};
WL.JSONStore.get('collection').add(data, {additionalSearchFields: {key: 'value'}})
The example assumes the collection was created with a search field for hello as string and an additional search field for key as string. It also assumes there's a collection initialized called collection.
Everybody!
I need to read and write a history data array.My data does loose data while page refresh. Thanks!
I resolved this problem by using LocalStore HTML 5.
With a some simple data, you can use:
var data = {};// data is a object just include text and value.
data = {"key1": value1, "key2": value2};// Example, i have a this object.
//===> We save a object "history" by a string of "data" var.
localStorage.setItem('history', JSON.stringify(data));
// ===> And get it:
var retrievedHistory = localStorage.getItem('history');
// In Sencha Touch, you can parse this oject to your model. and Syns it.
var history = Ext.getStore("HistoryTracking");
history.removeAll();
var num = Object.keys(data).length;
for (i = 0; i < num; i++)
{
var string = '' + data["trackID" + i];
history.add(string);
}
history.sync();
Hope my sharing help you have same problem!