An overview of java script in 2015 (ecma script 6)
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This document provides an overview of new features introduced in ECMAScript 6 (ES6), the sixth edition of JavaScript. It describes features like arrow functions, binary and octal literals, block scoping with let and const, classes, default parameter values, destructuring assignments, iterators and generators, shorthand methods and properties, rest parameters, spread operators, and template strings. Many of these new features allow for more concise code while maintaining backwards compatibility with older JavaScript versions.
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Peggy elasticsearch應用
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- 2. Language Features This sixth edition of JavaScript introduces a lot of new language syntax features, it might even be the most feature packed revision to date in terms of language additions, and that is with some of the features scheduled, like comprehensions and rest and spread properties being delayed to the next edition. These features are also backwards compatible, in the sense that they are mostly syntactic sugar and can be desugared to older versions of the language, meaning we can use them right now with a source to source compiler (otherwise known as a transpiler).
- 3. Arrow Functions(1) Arrow functions are a function shorthand using the => syntax. However, unlike normal functions however, arrows share the same lexical this as their surrounding code.
- 5. Binary and Octal Literals(1) Binary and Octal literals are new forms of numeric literals added for binary and octal numbers, denoted by b and o respectively.
- 7. BlockScoping Block scoping are new forms of declaration for defining variables scoped to a single block, as opposed to variables declared with var which have a function-level scope. Let Const
- 8. BlockScoping -Let(1) We can use let in-place of var to define block-local variables without having to worry about them clashing with variables defined elsewhere within the same function body.
- 10. BlockScoping -Const(1) const follows the same rules as let, except that the value is immutable so we can only assign to it once.
- 12. Classes(1) Classes are a concise declarative syntax for writing object oriented prototype patterns with a classical classes approach, the class syntax has support for inheritance, super calls, instance and static properties and constructors.
- 13. Classes(2)
- 14. Classes(3)
- 15. Default Parameter Values(1) Default parameter values allows us to initialize parameters when they were not explicitly provided.Where-as previously we would often check for undefined and assign default values.
- 17. Destructuring Assignments (1) Destructuring assignment allows us to assign parts of an object to several variables at once.
- 19. Iterators(1) Iterators allow iteration over arbitrary objects, while this by itself is not strictly a language feature, rather a protocol/pattern that is implemented by the core library, it does tie into other language features such as generators and for-for which work with this pattern. The iterator protocol takes the following form, any object can be an iterator as long as it defines a next() method. Any object can be iterable as long as it defines an iterator method, the named of the method is obtained through Symbol.iterator, often denoted with @@iterator.
- 20. Iterators(2)
- 21. Iterators- ForOf(1) The for-of loop allows you to conveniently loop over iterable objects.
- 23. Generators(1) Generators make it easy to create iterators. Instead of tracking state yourself and implementing iterator, you just use yield (or yield* to yield each element in an iterator).
- 24. Generators(2)
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