javascript – Promises – Asynchronous API request
This is an example of a simple GET API call wrapped in a promise to take advantage of its asynchronous functionality. va...
Tags：javascript
javascript – Testing for IndexedDB availability
You can test for IndexedDB support in the current environment by checking for the presence of the window.indexedDB prope...
javascript – Date – Convert to a string format
Convert to String var date1 = new Date(); date1.toString(); Returns: "Fri Apr 15 2016 07:48:48 GMT-0400 (Eastern Da...
javascript – Parsing a simple JSON string
The JSON.parse() method parses a string as JSON and returns a JavaScript primitive, array or object: const array = JSON....
javascript – Variable coercion/conversion – Convert string to float
parseFloat accepts a string as an argument which it converts to a float/ parseFloat("10.01") // = 10.01 if you...
Using HTML comments in JavaScript (Bad practice)
HTML comments (optionally preceded by whitespace) will cause code (on the same line) to be ignored by the browser also, ...
javascript – Arithmetic (Math) – Multiplication (*)
The multiplication operator (*) perform arithmetic multiplication on numbers (literals or variables). console.log( 3 * 5...
javascript – Debugging – Automatically pausing execution
In Google Chrome, you can pause execution without needing to place breakpoints. Pause on Exception: While this button is...
javascript – Performance Tips – Be consistent in use of Numbers
If the engine is able to correctly predict you’re using a specific small type for your values, it will be able to ...
javascript – Binary Data – Using TypedArrays
TypedArrays are a set of types providing different views into fixed-length mutable binary ArrayBuffers. For the most par...
javascript – Get the current time and date
Use new Date() to generate a new Date object containing the current date and time. Note that Date() called without argum...
javascript – Objects – Accesor properties (get and set)
5 Treat a property as a combination of two functions, one to get the value from it, and another one to set the value in ...
javascript – Strings – Trim whitespace
To trim whitespace from the edges of a string, use String.prototype.trim: " some whitespaced string ".trim(); ...
javascript – Method Chaining – Chainable object design and chaining
Chaining and Chainable is a design methodology used to design object behaviors so that calls to object functions return ...
javascript – Built-in Constants – Math library functions that return NaN
Generally, Math functions that are given non-numeric arguments will return NaN. Math.floor("a") The square roo...