Many developers were frustrated about JavaScript, especially before ECMAScript 2015 standard. And they had the right too: the language is known for its weakness and initial design drawbacks. How did it happen? At the beginning of the web era, no one did know how exactly the web will look in 10 - 15 years. And especially that a small Java's brother JavaScript will become the… Continue reading
It's known that before ECMAScript 2015 JavaScript language was tricky. For simple scripts ES5 code works fine. But as soon as the application complexity grows, you start to feel that the lack of language constructs is making your code unpleasant. Because you have to implement the application requirements, you can't jump over the parts of code that are troublesome to implement in ES5 style. The… Continue reading
Symbol is a new primitive type available from ECMAScript 2015, which allow to create unique identifiers let uniqueKey = Symbol('SymbolName'). You may use symbols as keys of properties in objects. A list of symbols that JavaScript treats specially is published as well-known symbols. Well-known symbols are used by built-in JavaScript algorithms. For example Symbol.iterator is utilized to iterate over items in arrays, strings, or… Continue reading