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Variables in standard JavaScript have no type attached, ... // => 2 // as compared to normal numeric keys normalObject [1] = 1; ... arrow function syntax was added ...
A higher-order function is a function that takes a function as an argument or returns one as a result. This is commonly used to customize the behavior of a generically defined function, often a looping construct or recursion scheme. Anonymous functions are a convenient way to specify such function arguments. The following examples are in Python 3.
Immediately invoked function expressions may be written in a number of different ways. [3] A common convention is to enclose the function expression – and optionally its invocation operator – with the grouping operator, [4] in parentheses, to tell the parser explicitly to expect an expression.
Arrow functions were first introduced in 6th Edition – ECMAScript 2015. They shorten the syntax for writing functions in JavaScript. Arrow functions are anonymous, so a variable is needed to refer to them in order to invoke them after their creation, unless surrounded by parenthesis and executed immediately. Here is an example of JavaScript ...
For example, arrow functions, which are specified in ES6, are converted into regular function declarations. [9] Non-standard JavaScript syntax such as JSX can also be transformed. [10] [11] Babel can automatically inject polyfills provided by core-js [12] for support features that
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The arrow operator => is used to define an arrow function expression, and an Array.filter method [8] instead of a global filter function, but otherwise the structure and the effect of the code are the same. A function may create a closure and return it, as in this example: