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CSS-in-JS is a styling technique by which JavaScript is used to style components. When this JavaScript is parsed, CSS is generated (usually as a <style> element) and attached into the DOM. It enables the abstraction of CSS to the component level itself, using JavaScript to describe styles in a declarative and maintainable way.
Dynamic styles are a key feature of DHTML. By using CSS, one can quickly change the appearance and formatting of elements in a document without adding or removing elements. This helps keep documents small and the scripts that manipulate the document fast. The object model provides programmatic access to styles.
Array#map passes 3 arguments to func: the element, the index of the element, and the array. Unused arguments can be omitted. Unused arguments can be omitted. Stops at the end of List1 , extending the shorter arrays with undefined items if needed.
The following list contains syntax examples of how a range of element of an array can be accessed. In the following table: first – the index of the first element in the slice; last – the index of the last element in the slice; end – one more than the index of last element in the slice; len – the length of the slice (= end - first)
In Raku, a sister language to Perl, for must be used to traverse elements of a list (foreach is not allowed). The expression which denotes the collection to loop over is evaluated in list-context, but not flattened by default, and each item of the resulting list is, in turn, aliased to the loop variable(s). List literal example:
Folds can be regarded as consistently replacing the structural components of a data structure with functions and values. Lists, for example, are built up in many functional languages from two primitives: any list is either an empty list, commonly called nil ([]), or is constructed by prefixing an element in front of another list, creating what is called a cons node ( Cons(X1,Cons(X2,Cons ...
The elements of the dynamic array are stored contiguously at the start of the underlying array, and the remaining positions towards the end of the underlying array are reserved, or unused. Elements can be added at the end of a dynamic array in constant time by using the reserved space, until this space is completely consumed.
Instantiate an element once per item from a collection. ng-show & ng-hide Conditionally show or hide an element, depending on the value of a Boolean expression. Show and hide is achieved by setting the CSS display style. ng-switch Conditionally instantiate one template from a set of choices, depending on the value of a selection expression. ng-view