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What are all the uses of an underscore in Scala?
...s
List(1, 2, 3) foreach println _
Converting call-by-name parameters to functions
def toFunction(callByName: => Int): () => Int = callByName _
Default initializer
var x: String = _ // unloved syntax may be eliminated
There may be others I have forgotten!
Example showing why foo(_...
Permutations in JavaScript?
I'm trying to write a function that does the following:
35 Answers
35
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Scratch还是App Inventor？低代码编程工具2026终极横评：谁才是真正的入门...
...全球化，作品分享平台成熟
App Inventor 2：中文社区（如fun123.cn）本土化完善
维度：进阶路径
Scratch：→ Python/JavaScript
App Inventor 2：→ Python/Java/Kotlin
详细对比
场景1：给小学生做编程启蒙
如果你的孩子刚上小学，从...
Determine when a ViewPager changes pages
...geListener(object : ViewPager.OnPageChangeListener {
override fun onPageScrollStateChanged(state: Int) {
}
override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {
}
override fun onPageSelected(posi...
check android application is in foreground or not? [duplicate]
...
class ArchLifecycleApp : Application(), LifecycleObserver {
override fun onCreate() {
super.onCreate()
ProcessLifecycleOwner.get().lifecycle.addObserver(this)
}
@OnLifecycleEvent(Lifecycle.Event.ON_STOP)
fun onAppBackgrounded() {
Log.d("MyApp", "App in back...
Type definition in object literal in TypeScript
... as Alternative)
After many years of using const and benefiting from more functional code, I would recommend against using the below in most cases. (When building objects, forcing the type system into a specific type instead of letting it infer types is often an indication that something is wrong)....
Multiprocessing: How to use Pool.map on a function defined in a class?
...
I also was annoyed by restrictions on what sort of functions pool.map could accept. I wrote the following to circumvent this. It appears to work, even for recursive use of parmap.
from multiprocessing import Process, Pipe
from itertools import izip
def spawn(f):
def fun(...
Get color value programmatically when it's a reference (theme)
...
To add to the accepted answer, if you're using kotlin.
@ColorInt
fun Context.getColorFromAttr(
@AttrRes attrColor: Int,
typedValue: TypedValue = TypedValue(),
resolveRefs: Boolean = true
): Int {
theme.resolveAttribute(attrColor, typedValue, resolveRefs)
return typedVal...
How can I profile Python code line-by-line?
...rt Kern's line_profiler is intended for. From the link:
File: pystone.py
Function: Proc2 at line 149
Total time: 0.606656 s
Line # Hits Time Per Hit % Time Line Contents
==============================================================
149 ...
Mean per group in a data.frame [duplicate]
...columns 3 and 4 of data.frame d, grouping by d$Name, and applying the mean function.
Or, using a formula interface:
aggregate(. ~ Name, d[-2], mean)
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