Python 潮流周刊#142：Python 性能优化的进阶之路

Welcome to the MDN beginner's JavaScript course! In this article we will look at JavaScript from a high level, answering questions such as "What is it?" and "What can you do with it?", and making sure you are comfortable with JavaScript's purpose.

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The at() method of Array instances takes an integer value and returns the item at that index, allowing for positive and negative integers. Negative integers count back from the last item in the array.

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In your development process, you'll undoubtedly be required to run some commands in the terminal (or on the "command line" — these are effectively the same thing). This article provides an introduction to the terminal, the essential commands you'll need to enter into it, how to chain commands together, and how to add your own command line interface (CLI) tools.

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Default function parameters allow named parameters to be initialized with default values if no value or undefined is passed.

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In this first Express article we answer the questions "What is Node?" and "What is Express?", and give you an overview of what makes the Express web framework special. We'll outline the main features, and show you some of the main building blocks of an Express application (although at this point you won't yet have a development environment in which to test it).