TIL - Today I learned
javascript
- +-0, NaN and Object.is in JavaScript
- lookaheads (and lookbehinds) in JavaScript regular expressions
- You can't set new properties on JavaScript Symbols
- How the rest operator and default values affect the function length property
- The global `Reflect` object, its use cases and things to watch out for
- Not every JavaScript function is constructable
- Measuring execution time more precisely in the Browser and Node.js
- Await in async functions works for any thenable
- isNaN is not equal Number.isNaN
- includes really is the better indexOf
- localeCompare helps to compare strings in a sane manner
- IntersectionObserver accepts several threshold values
- There is a Unicode mode in JavaScript regular expressions
- Equality of object property names depends on code units
- The dot in RegExp doesn't match all characters in JavaScript
- Proper Tail Calls (PTC) in JavaScript
- Implicit form submission doesn't work always
- Conditional properties with object spread
- Completion values in JavaScript
- var let = 12 is valid JavaScript
- finally in a try/catch statements really goes over everything
- Skipped holes in JavaScript Arrays
- Interfere Constructor calls with ES6 Proxies
node.js
- Node.js sends warnings when you add too many listeners to an event emitter
- The global `Reflect` object, its use cases and things to watch out for
- How to figure out the Node.js entry script with process.mainModule or require.main
- How to quickly perform a syntax check of a JavaScript file
- Measuring execution time more precisely in the Browser and Node.js
- Commands in the Node.js REPL
- console.dir() is short for console.log( util.inspect() )