为什么需要 "use strict"：一段语言兼容性的历史 长久以来，JavaScript 不断向前发展，新特性被陆续加入，而旧功能也一直保持不变—— 从未带来任何兼容性问题。这样做的好处是旧代码永远可以运行，但代价同样明显：JavaScript 创造者早期的任何错误或不够完善的决定，也会被永久保留在语言中 ...

在 JavaScript 的函数式编程实践中， 不可变性（Immutability） 是绕不开的基石性概念：它决定了数据一旦创建便不再被原地修改，任何"变更"都通过创建新数据来完成。本文以仓库中的 immutability.md 为核心骨架，结合 immutability 集合 中的系列文章与源码级示例，为你讲透不可变性的原理、常见误区，以及 ...

covering all the hot paths through the loop. the VM would start tracing there. When the inner loop exits, the VM would detect that a different branch was taken. The VM would try to record a branch ...

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Veronica Beagle is the managing editor for Education at Forbes Advisor. She completed her master’s in English at the University of Hawai‘i at Mānoa. Before coming to Forbes Advisor she worked on ...