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JavaScript Pages

Dot Net Perls has example pages for many languages, with explanations and code side by side (for easy understanding).
C#F#GoJavaJavaScriptPythonRubyScalaSwiftVB.NETWPF

Object.

Use objects to provide lookups from keys to values. Objects have properties.JavaScript Object, Dictionary Examples

Arguments.

Use the arguments object in a function. Test the performance of arguments usage.JavaScript arguments (Function)

Array.

Create new arrays and add elements with methods like push. Get the length to count elements.JavaScript Array Examples

CharAt.

Get characters from a string with the charAt method and the string indexer. Use charCodeAt.JavaScript charAt: Get Char From String

EncodeURI.

Call the encodeURI and encodeURIComponent methods to format strings for the URL bar.JavaScript encodeURI Examples

For.

Loop over a range of numbers, or elements in an array, with for-loops and while-loops.JavaScript for Loop (for in, for of)

Function lookup table.

Create an object with function values. Perform lookups on the table to reduce branches.JavaScript function Lookup Table

Function.

Design functions with arguments and return values. Use immediately-invoked functions.JavaScript function Examples

IndexOf.

Call the indexOf function to find the location of a substring in a string. LastIndexOf searches in reverse.JavaScript indexOf and lastIndexOf

Int32Array.

Create and update an efficient integer array with the ArrayBuffer and Int32Array types.JavaScript Int32Array Examples

JSON.

Convert a JSON string to an array of objects with JSON.parse. Also use JSON.stringify.JavaScript JSON.parse, stringify Examples

Keywords.

Review language keywords and DOM methods that are used to create web applications.JavaScript Keywords

Multiple return values.

Return multiple values from a function with an array and an object in a single statement.JavaScript Multiple Return Values

ParseInt.

Convert strings to ints with the parseInt function. Use Number and parseFloat.JavaScript parseInt Examples

QuerySelector.

Use the querySelector function to evaluate a CSS selector and change DOM elements.JavaScript querySelector Examples

Replace.

Replace substrings with other substrings with the replace method. Use global replace.JavaScript replace Examples

Sort.

Order the elements in a string array with the sort method. The array is modified in-place.JavaScript Sort String Arrays

Split.

Separate parts from a string with the split function. Split on characters, strings and patterns.JavaScript split Examples

String.

Review string methods and string operators like equality tests. See string syntax.JavaScript String

Substring.

Get a new string in a range from a start to end index from an existing string with the substring method.JavaScript Substring Examples

Switch.

Select a case in the switch statement. Compare the switch to an if-else block.JavaScript switch Statement

ToLowerCase.

Transform the cases of strings with the toLowerCase and toUpperCase functions.JavaScript toLowerCase Examples

Typeof.

Invoke the typeof operator to determine the type of an object. See if a value is a string.JavaScript typeof String, Number
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