How to use the new features? Summarize the usage examples of new features

ECMAScript 6 (ES6 for short) is the latest standard for the JavaScript language. Because the current version of ES6 was released in 2015, it is also called ECMAScript 2015. WeChat applet supports most of the new features of ES6. Constants (Constant) ES6 adds the const keyword, which is used to declare constants. Once declared, the value of the constant cannot be changed. const is only valid within the block-level scope where it is declared. Scoping (Scope) ES6 adds the let keyword, which is used to declare variables, but the declared effect is only valid within the code block. The above code is in the code block and declares two variables using let and var respectively. Then these two variables are called outside the code block. As a result, the variable declared by let reports an error, and the variable declared by var returns the correct value. This shows that the variable declared by let is only valid in the code block in which it is located. The counter i in the above code is only valid within the for loop body. let adds a new block-level scope to JavaScript. The above function has two code blocks, both of which declare variables x and y, and output 1 2 after running. This represents the outer code

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Introduction: ECMAScript 6 (ES6 for short) is the latest standard for the JavaScript language. Because the current version of ES6 was released in 2015, it is also called ECMAScript 2015. WeChat applet supports most of the new features of ES6. C...

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5. php55 new feature yield generator

Introduction:: php55 new feature yield generator: php official document yield http://php.net/manual/zh/language.generators. overview.php reference: http://laravelacademy.org/post/4317.html Generators provide an easier way to implement simple object iteration, compared to the performance overhead and complexity of defining a class to implement the Iterator interface. Greatly reduced. Generators allow you to write code in foreach code blocks to

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Introduction: New features and deprecations in PHP 5.4 Summary of function function overview: 1. New features of PHP5.4 1. Memory and performance improvements: 20-50% memory savings in large PHP applications. Improve performance by 10-30% through various optimizations 2. Support Trait 3. Simplified array syntax, allowing you to define short arrays 4. Function array dereferencing, supporting Array dereferencing, 5. Instance method call 6. Closure binding 7. Objects are functions 8. Built-in We

7. hierarchyid type application in SQL Server 2008

Introduction: An important new feature of SQL Server 2008. The main problem solved is tables with hierarchical relationships. For example, the organizational chart is the most commonly used in our daily life. We generally use an Employees table to store employee data, and each employee may have a corresponding superior. In the past, to get all the superiors or all subordinates of an employee, we usually used

8. MySQL5 new features (stored procedures)

Introduction: Supporting stored procedures is one of MySQL5 Very important new features. Although some users do not want to encapsulate processes that reflect business logic in the database through stored procedures, most database managers still like to use stored procedures in the database because stored procedures have many benefits: Users can reuse them Code and change control - He Jiangye

9. MySQL6.0 new features_MySQL

Introduction: MySQL6.0 new features

10. Initial exploration of HTML 5 Web SQL Database

Introduction: Some new features of HTML 5 and a complete HTML 5 page created through examples. But the HTML 5 standard is not limited to traditional markup languages. It also has many anticipated API interfaces. Using these interfaces, developers can create richer and more eye-catching applications... ..., .

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Looking for a blog or website with detailed introduction to the new features and detailed introduction of each version of Java JDK5/6/7/8, preferably in Chinese, thank you?

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