Tutorial by Examples: s

Iterator methods can be broken into two distinct groups: Adapters Adapters take an iterator and return another iterator // Iterator Adapter // | | let my_map = (1..6).map(|x| x * x); println!("{:?}", my_map); Output Map { iter: 1..6 } Note that the v...

If you want to remove calls to certain methods, assuming they return void and have no side affects (as in, calling them doesn't change any system values, reference arguments, statics, etc.) then you can have ProGuard remove them from the output after the build is complete. For example, I find this ...

For functions that need to take a collection of objects, slices are usually a good choice: fn work_on_bytes(slice: &[u8]) {} Because Vec<T> and arrays [T; N] implement Deref<Target=[T]>, they can be easily coerced to a slice: let vec = Vec::new(); work_on_bytes(&vec); le...

The following output equivalent results: class IfElseExample { public string DebugToString(object a) { if (a is StringBuilder) { return DebugToStringInternal(a as StringBuilder); } else if (a is List<string>) { ...

template <div id="demo">{{fullName}}</div> watch example var vm = new Vue({ el: '#demo', data: { firstName: 'Foo', lastName: 'Bar', fullName: 'Foo Bar' } }) vm.$watch('firstName', function (val) { this.fullName = val + ' ' + this.lastName })...

This example portrays the most simple ALV creation using the cl_salv_table class and no additional formatting options. Additional formatting options would be included after the TRY ENDTRY block and before the alv->display( ) method call. All subsequent examples using the ABAP Objects approach to...

This example hides the MANDT (client) field from the ALV. Note that the parameter passed to get_column( ) must be capitalized in order for this to work. alv->get_columns( )->get_column( 'MANDT' )->set_visible( if_salv_c_bool_sap=>false ).

The column text may change upon the horizontal resizing of a column. There are three methods to accomplish this: Method NameMaximum Length of Headingset_short_text10set_medium_text20set_long_text40 The following example shows usage of all three. A column object is declared and instantiated as a re...

This method increases readability by giving consecutive rows alternating background color shading. alv->get_display_settings( )->set_striped_pattern( if_salv_c_bool_sap=>true ).

By default, when an ALV is displayed, the title at the top is just the program name. This method allows the user to set a title of up to 70 characters. The following example shows how a dynamic title can be set that displays the number of records displayed. alv->get_display_settings( )->set_l...

Suppose you have a parentView into which you want to insert a new subView programmatically (eg. when you want to insert an UIImageView into a UIViewController's view), than you can do it as below. Objective-C [parentView addSubview:subView]; Swift parentView.addSubview(subView) You can also...

CSS .bordered { border-image: linear-gradient(to right, red 20%, green 20%, green 40%, blue 40%, blue 60%, maroon 60%, maroon 80%, chocolate 80%); /* gradient with required colors */ border-image-slice: 1; } HTML <div class='bordered'>Border on all sides</div> The above ex...

Formats results of SELECT query as JSON text. FOR JSON PATH clause is added after query: SELECT top 3 object_id, name, type, principal_id FROM sys.objects FOR JSON PATH Column names will be used as keys in JSON, and cell values will be generated as JSON values. Result of the query would be an a...

FOR JSON PATH enables you to control format of the output JSON using column aliases: SELECT top 3 object_id as id, name as [data.name], type as [data.type] FROM sys.objects FOR JSON PATH Column alias will be used as a key name. Dot-separated column aliases (data.name and data.type) will be gen...

WITHOUT_ARRAY_WRAPPER option enables you to generate a single object instead of the array. Use this option if you know that you will return single row/object: SELECT top 3 object_id, name, type, principal_id FROM sys.objects WHERE object_id = 3 FOR JSON PATH, WITHOUT_ARRAY_WRAPPER Single obje...

FOR JSON clause ignores NULL values in cells. If you want to generate "key": null pairs for cells that contain NULL values, add INCLUDE_NULL_VALUES option in the query: SELECT top 3 object_id, name, type, principal_id FROM sys.objects FOR JSON PATH, INCLUDE_NULL_VALUES NULL values in...

Wraps returned JSON array in additional root object with specified key: SELECT top 3 object_id, name, type FROM sys.objects FOR JSON PATH, ROOT('data') Result of the query would be array of JSON objects inside the wrapper object: { "data":[ {"object_id":3,&qu...

Automatically nests values from the second table as a nested sub-array of JSON objects: SELECT top 5 o.object_id, o.name, c.column_id, c.name FROM sys.objects o JOIN sys.columns c ON o.object_id = c.object_id FOR JSON AUTO Result of the query would be array of JSON objects: [ { &...

If you need some complex JSON structure that cannot be created using FOR JSON PATH or FOR JSON AUTO, you can customize your JSON output by putting FOR JSON sub-queries as column expressions: SELECT top 5 o.object_id, o.name, (SELECT column_id, c.name FROM sys.columns c WHERE o...

Select all columns from some table (system table in this case): SELECT * FROM sys.objects Or, select just some specific columns: SELECT object_id, name, type, create_date FROM sys.objects