Tutorial by Topics: ons

Function functionName(argumentVariable As dataType, argumentVariable2 As dataType, Optional argumentVariable3 As dataType) As functionReturnDataType Basic declaration of a function. Every function needs a name, but it does not have to take any arguments. It may take 0 arguments, or it may take ...

Terms and concepts Screen size Actual physical size, measured as the screen's diagonal. For simplicity, Android groups all actual screen sizes into four generalized sizes: small, normal, large, and extra-large. Screen density The quantity of pixels within a physical area of the screen; usu...

Column typeDescription:primary_keyPrimary key:stringShorter string datatype. Allows limit option for maximum number of characters.:textLonger amount of text. Allows limit option for maximum number of bytes.:integerInteger. Allows limit option for maximum number of bytes.:bigintLarger integer:float...

Functions and subroutines, in conjunction with modules, are the tools to break down a program into units. This makes the program more readable and manageable. Each one of these units can be thought of as part of the code that, ideally, could be compiled and tested in isolation. The main program(s...

String functions perform operations on string values and return either numeric or string values. Using string functions, you can, for example, combine data, extract a substring, compare strings, or convert a string to all uppercase or lowercase characters. CONCAT ( string_value1, string_value...

django-admin commandDetailsmakemigrations <my_app>Generate migrations for my_appmakemigrationsGenerate migrations for all appsmakemigrations --mergeResolve migration conflicts for all appsmakemigrations --merge <my_app>Resolve migration conflicts for my_appmakemigrations --name <migr...

funcname = function(paramA, paramB, ...) body; return exprlist end -- a simple function function funcname(paramA, paramB, ...) body; return exprlist end -- shorthand for above local funcname = function(paramA, paramB, ...) body; return exprlist end -- a lambda local funcname; funcname = functio...

Help text can be located before or after the function line, as long as there is not code between the function line and the start of the help text. Capitalization of the function name only bolds the name, and is not required. If a line is prepended with See also, any names on the line that mat...

(function name) ; retrieves the function object of that name #'name ; syntactic sugar for (function name) (symbol-function symbol) ; returns the function bound to symbol (funcall function args...) ; call function with args (apply function arglist) ; call function with arguments given in a list...

ParameterDetailsos.F_OKValue to pass as the mode parameter of access() to test the existence of path.os.R_OKValue to include in the mode parameter of access() to test the readability of path.os.W_OKValue to include in the mode parameter of access() to test the writability of path.os.X_OKValue to in...

These language extensions are typically available when using the Glasgow Haskell Compiler (GHC) as they are not part of the approved Haskell 2010 language Report. To use these extensions, one must either inform the compiler using a flag or place a LANGUAGE programa before the module keyword in a ...

fun Name(Params) = ... fun Name(Params) {...} fun Name(Params): Type {...} fun <Type Argument> Name(Params): Type {...} inline fun Name(Params): Type {...} { ArgName: ArgType -> ... } { ArgName -> ... } { ArgNames -> ... } { (ArgName: ArgType): Type -> ... } Paramet...

Constructor functions are actually just regular functions, there's nothing special about them. It's only the new keyword which causes the special behavior shown in the examples above. Constructor functions can still be called like a regular function if desired, in which case you would need to bind...

WITH cte_name [(column_name_1, column_name_2, ...)] AS (cte_expression) It is necessary to separate a CTE from the previous statement with a semi-colon (;) character. i.e. ;WITH CommonTableName (...) SELECT ... FROM CommonTableName ... A CTE's scope is a single batch, and only downstream ...