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I often write pretty complex toString() methods and this question is always bothering me - which variant is more clear to read. Following examples are simplified, usually there are a lot of conditionals, so single liners are not fit.
1) like in plain java:
val sb = StringBuilder()
sb.append(data)
val string = sb.toString()
2) apply + toString() - not pretty yeah?
val string = StringBuilder().apply {
append(data)
}.toString()
3) run + toString() last statement also is not superb
val string = StringBuilder().run {
append(data)
toString()
}
4) ??
#dyukha answer is 100% best choice:
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/build-string.html
It's just
val s = buildString { append(data) }
You could skip the StringBuilder and use Kotlin's built-in String Interpolation:
val string = "$data"
Or if things are more complicated:
val string = "The answer is: $data"
Or, using raw strings:
val string =
"""
{
"name": $name,
"value": $value
}
"""
Related
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I am trying to convert the string in my code to float but using atof() for a sub string seems not be working. Advise on how to go about it appropriately will be appreciated.
It is for a BME280 sensor using 433MHz transmitter and receiver
void loop{
if(rfrx.recv(buff, &bufflen)){
String rxstr = String((char*)buff);
for (int i=0;i=rxstr.length();i++){
if (rxstr.substring(i,i+1) == ","){
String T = rxstr.substring(0,i);
String P = rxstr.substring(i+1);
String A = rxstr.substring(i+2);
String H = rxstr.substring(i+3);
break;
}
}
}
}
Have figured it out
The .toFloat()
Thanks
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I'm new to Haskell and I'm not sure how to work around the If-Else, for example:
function str = if ((length str) = 2) then (....)
In java we would:
if (str.length =2){
str = "2"}
else { str ="1"}
How do you write it in haskell?
You can use Guards:
fnc :: String -> String
fnc s | length s == 2 = ...
| otherwise = ...
More to Guards
Or conditions
fnc :: String -> String
fnc s = if length s == 2 then ... else ...
It is also possible to use pattern matching, more here.
There are several ways to achieve conditions (e.g. case of) in Haskell.
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Is there any way to use variable itself inside without it's name?
For example, I have a string like this:
someStuffVariableName = "abcdefghijklmnop..."
If I want to manipulate it, I need to write every time name of this var but it's so long:
someStuffVariableName = someStuffVariableName[0:-1]
But,anyway,can I do like this:
someStuffVariableName = self[0:-1] or someStuffVariableName = this.value[0:-1]?
There is not.
Your best options are:
Use a more concise variable name (but don't give up readability!)
Just deal with the length
Note that in some cases, the answer is actually yes. For instance, you can often write x += y instead of x = x + y, and x /= y instead of x = x / y.
But this is for assignment operators only.
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I'm trying to sort the characters in a string by sorting a slice of the bytes in the string (using sort.Slice). The code I'm using gets the right results sometimes but other times produces results I can't make sense of.
package main
import (
"fmt"
"sort"
)
func main() {
for _, s := range []string{"nat", "tan", "ant"} {
b := []byte(s)
sort.Slice(b, func(i int, j int) bool { return s[i] < s[j] })
fmt.Println(s, string(b))
}
}
https://play.golang.org/p/bC9QWq7aF3G
I would expect "nat", "tan" and "ant" to all be sorted to "ant", but "tan" is sorted to "atn".
Change your sort.Slice line to:
sort.Slice(b, func(i int, j int) bool { return b[i] < b[j] })
sort.Slice needs your less function to compare values in the slice in order to sort the way you intended. Your bug is that you used s rather than b in your less function.
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How do I get maximum key values in a Map and let's say save it to a List?
For example, is there is a Map:
John, 30
Alexander, 10
Ivan, 20
Steven, 30
The result must be a List: John, Steven
Without additional List...
Double max = 0d;
for (String key : wagesList.keySet()) {
if (wagesList.get(key) > max) {
max = wagesList.get(key);
}
}
for (String key : wagesList.keySet()) {
if (wagesList.get(key).equals(max)) {
System.out.println(key);
}
}