It is currently the main language for client-side programming in web browsers. It also starts being heavily used on the server side through environments such as node.js. It is designed to be a prototype-based object-oriented scripting language, weak and dynamic typing and first-class functions. It supports functional programming and features features such as locks and high order functions commonly unavailable in popular languages such as Java and C ++.
It is based on ECMAScript standardized by Ecma international in the ECMA-262 specifications
The following features are common to all implementations conforming to ECMAScript.
eval that can execute language commands that are written to a string at runtime.
First class functions [edit | Edit source-code]
‘Internal’ or ‘nested’ functions are functions defined within other functions. They are created each time the function containing them (external) is invoked. In addition, the scope of the external function, including constants, local variables, and argument values, becomes part of the internal state of each object created from the internal function, even after the execution of the internal function is completed.
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