What happens is that the console keeps a reference to the array, so when the user unfolds the array it then shows the current value of the array ... ... <看更多>

Web Dev Roadmap for Beginners (Free!): https://bit.ly/DaveGrayWebDevRoadmapI was checking for empty Arrays wrong... and in this tutorial, ... ... <看更多>

The length property is read/write property of an Array object. When the length property is set to zero, all elements of the array are automatically deleted. 3) ... ... <看更多>

array.length is zero, but the array has elements in it ... is an empty array) so when you will assign -> number: books.length it will be equal to 0. ... <看更多>

Suggestion Search Terms Array Destructuring, ... non-ECMAScript syntax with JavaScript output, new syntax sugar for JS, etc.) ... <看更多>

That is when it comes to the number index values of arrays the numbers start at zero rather than one as with the array length property so ... ... <看更多>

In practice it will depend on the JavaScript executor how it handles it. The check should effectively be done by the forEach as it has to ... ... <看更多>