gosl | write script with the Go language | Script Programming library
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QUESTION
I have a button element with function called run()
and I'm trying to change another button's disabled attribute after one click, to reset the output.
That's the code:
ANSWER
Answered 2021-Feb-07 at 09:37Did you check if you newButton
is correctly get? Because you have a space in your ID java runner
.
Can you try with an ID without space? It may need to update your HTML as well
QUESTION
The task is to append a swarm of small circles around the nodes of a tree (where I have placed bigger circles). The depth of the tree is tiny -- just two, However, there is a slight degree of complexity when considering I'm appending several trees iteratively.
To keep it simple, I didn't even try to append swarms to all trees. Instead, I set myself with a more modest goal of appending the swarm to just one node of one tree. Comments and snippet below:
...ANSWER
Answered 2021-Feb-01 at 16:00The error is relatively straightforward: your node isn't an object. The nodes you are passing to the force simulation are strings:
QUESTION
Lets suppose i have two strings string1
and string2
.
var string1 = "images of canadian geese goslings";
var string2 = "Canadian geese with goslings pictures to choose from, with no signup needed";
I need to find biggest substring of string1
which matches in string2
.
here biggest substring will be "canadian geese"
which is matching in string2
.
How can I find it? I tried breaking string1
into char[]
and find words then merged matched words but that failed my objective.
ANSWER
Answered 2020-Sep-15 at 09:58classy loop approach - the result includes te space after geese "canadian geese "
QUESTION
So I have nested div
tags in the HTML file. I was trying to copy certain texts from each div
tag. After searching for several hours finally I found the solution which worked. The solution below:
ANSWER
Answered 2020-Sep-07 at 11:18I modified your code a bit please have a look, and see if this helps.
QUESTION
...I am trying to use the below data to get the 'Total Facebook likes' for each unique actor. The output should be in two columns, column 1 containing the unique actor names from all the actor_name columns and column 2 should have the total likes from all three actor_facebook_likes columns. Any idea on how this can done, will be appreciated.
ANSWER
Answered 2020-Jun-17 at 22:14This makes the job :
QUESTION
I'm coming from a Java background, and I'm trying to wrap my head around Haskell's type system. In the Java world, the Liskov Substitution Principle is one of the fundamental rules, and I'm trying to understand if (and if so, how) this is a concept that applies to Haskell as well (please excuse my limited understanding of Haskell, I hope this question even makes sense).
For example, in Java, the common base class Object
defines the method boolean equals(Object obj)
which is consequently inherited by all Java classes and allows for comparisons like the following:
ANSWER
Answered 2020-Aug-03 at 21:51tl;dr: “Does Haskell's type system honor the Liskov Substitution Principle?” ——Not only does it honor the LSP, it enforces it!
Now, Haskell's
Eq
type class is a completely different animal
Yes, and in general type classes are a completely different animal (or meta-animal?) from OO classes. The Liskov Substitution Principle is all about subclasses as subtypes. So first of all a class needs to define a type, which OO classes do (even abstract ones / interfaces, only, for those the values must be in a subclass). But Haskell classes don't do anything like this at all! You can't have a “value of class Eq
”. What you actually have is a value of some type, and that type may be an instance of the Eq
class. Thus, class semantics are completely detached from value semantics.
Let's formulate that paragraph also as a side-by-side comparison:
- OO: classes contain
- values (better known as objects★)
- subclasses (whose values are also values of the parent class)
- Haskell: classes contain
- types (known as instances of the class)
- subclasses (whose instances are also instances of the parent class)
Note that the description of a Haskell class does not even mention values in any way. (As a matter of fact, you can have classes that don't even have methods that are concerned with any runtime values!)
So, now we've established subclassing in Haskell has nothing to do with values of a subclass, it's clear that the Liskov principle can't even be formulated on that level. You could formulate something similar for types:
- If
D
is a subclass ofC
, then and type that's an instance ofD
can also be used as an instance ofC
– which is absolutely true, albeit not really talked about; indeed the compiler enforces this. What it entails is
- In order to write an
instance Ord T
for you typeT
, you must first also write aninstance Eq T
(which would of course be just as valid on its own, irrespective of whether theOrd
instance is defined too) - If the constraint
Ord a
appears in a function's signature, then the function can automatically also assume that the typea
has a validEq
instance too.
That may not be a really interesting answer to the question of Liskov in Haskell.
Here's something that makes it a bit more interesting though. Did I say Haskell doesn't have subtypes? Well, actually it does! Not plain old Haskell98 types, but universally quantified types.
DON'T PANIC I'll try to explain what that is with an example:
QUESTION
I am creating a GIF search web app with the GIPHY API and react.
After I fetch the data from the API, I can index the data console.log(json.data[0])
ANSWER
Answered 2020-Jul-31 at 09:49Try to console.log
data like:
QUESTION
I successfully got the Spotify API to work with spotify-web-api-js, but I have no idea how to decode this. I want to be able display the title and artist of the song currently playing on a HTML page.
Right now to test, I'm trying to use (
data
is the stuff from the Spotify api) to get the timestamp since I don't know what the format is to go deeper into the Spotify response. I get an Uncaught TypeError: Cannot read property 'timestamp' of undefined
.
Note: I'm new to coding
Here's the javascript that gets the stuff from Spotify:
...ANSWER
Answered 2020-Jun-20 at 04:59I got it! I was messing around and put console.log(data.item.name)
and it successfully got the title of the song! For the HTML part, I had trouble getting the variables from the HTML, so I just moved the document.getElementId("song")...
to the javascript!
Here's what the final script looks like:
QUESTION
I have multiple jsons coming from any restapi's and I don't know the schema of it. I am unable to use the explode function of dataframes , because i am unaware about the column names, which is getting created by spark api.
1.Can we store the keys of the nested arrays elements keys by decoding values from dataframe.schema.fields
, As spark only provides the value part in the rows of the dataframe and take the top level key as column name.
Dataframe --
...ANSWER
Answered 2020-May-28 at 06:40Created helper function & You can directly call df.explodeColumns
on DataFrame.
Below code will flatten multi level array & struct type columns.
QUESTION
In this React component, I'm trying to fetch data from the GIPHY API and render it in another component. The fetch is working correctly, but this.state.gifs.map
returns an error because it runs before the fetch is complete and the state is set. I have tried using Hooks with async/await but that did not seem to work either. How can I create my gifArray
after the state is set so I'm not trying to run .map
on an empty array.
ANSWER
Answered 2020-Mar-05 at 05:02You have to check first if gifs array is not empty. When the setState is done, render will trigger again, and this time there will be gifs to map.
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