List comprehension inside Spark’s array a = [1,2,3,4,5,6,7,8,9,10] df = spark.createDataFrame([[‘a b c d e f g h i j ‘],], [‘col1’]) df = df.withColumn(“NewColumn”, F.array([F.lit(x) for x in a])) df.show(truncate=False) df.printSchema() # +——————–+——————————-+ # |col1 |NewColumn | # +——————–+——————————-+ # |a b c d e f g h i j |[1, 2, 3, 4, … Read more
Yes, you should use the f suffix. Reasons include: Performance. When you write float foo(float x) { return x*3.14; }, you force the compiler to emit code that converts x to double, then does the multiplication, then converts the result back to single. If you add the f suffix, then both conversions are eliminated. On … Read more
In C++0x you will be able to use your desired syntax: vector<vector<vector<string> > > vvvs = { { {“x”,”y”, … }, … }, … }; But in today’s C++ you are limited to using boost.assign which lets you do: vector<string> vs1; vs1 += “x”, “y”, …; vector<string> vs2; … vector<vector<string> > vvs1; vvs1 += vs1, … Read more
=== is the Identity operator, and is used to test that value and type are equal. so.. “3” == 3 // true “3” === 3 // false 1 == true // true 1 === true // false “1” == true // true “1” === true // false so when you care that value and type … Read more
Edit Sep 2022: With Typescript 4.9 we can now use satisfies operator: type MyType = { name: string } const x ={ name: ‘test’, // Autocompleted, typesafe } as const satisfies MyType x.name // type is ‘test’ (not string) And if for some reason, you can’t use satisfies, it’s fairly easy to replicate the same … Read more
This code is fine across all platforms. The string gets compiled into the binary as a static string literal. If you are on windows for example you can even open your .exe with notepad and search for the string itself. Since it is a static string literal scope does not matter. String pooling: One thing … Read more
It makes it easier to pick out values in a memory dump. Example: enum state { waiting, running, stopped }; vs. enum state { waiting = ‘wait’, running = ‘run.’, stopped = ‘stop’ }; a memory dump after the following statement: s = stopped; might look like: 00 00 00 02 . . . . … Read more
XML literals are a feature of VB.NET, not C#. What you have posted is as close as you can get in C#. You may want to consider replacing the embedded double quotes with single quotes though (as both types are valid XML). For larger amounts of XML you may want to consider the answer from … Read more
As far as C++ is concerned: C++11, [lex.icon] ΒΆ2 The type of an integer literal is the first of the corresponding list in Table 6 in which its value can be represented. And Table 6, for literals without suffixes and decimal constants, gives: int long int long long int (interestingly, for hexadecimal or octal constants … Read more
What is the problem? The problem is that the Standard forbids it. Per paragraph 13.5.8./3 of the C++11 Standard on user-defined literals: The declaration of a literal operator shall have a parameter-declaration-clause equivalent to one of the following: const char* unsigned long long int long double char wchar_t char16_t char32_t const char*, std::size_t const wchar_t*, … Read more