这是一个简短的函数,使用了一些较新的JavaScript数组方法来展开n维数组。 function flatten(arr) { return arr.reduce(function (flat, toFlatten) { return flat.concat(Array.isArray(toFlatten) ? flatten(toFlatten) : toFlatten); }, []); }
你也许可以使用for-in(加上保护措施)来解决问题,但是有更适当的选项可供选择,因此不必尝试。创建真正的数组有时候,你可能想将一个类似数组的对象转换为真正的数组。这样做非常简单:Use Array.from Array.from (spec) | (MDN) (ES2015+, but easily polyfilled) creates an array from an array-like object,...
JavaScript arrays can contain all types of values and they can be of mixed types. You can create arrays in two different ways, the most common of which is to list values in a pair of square brackets. These are called array literals. var myArray = [element0, element1, ..., elementN...
16.0: Supported QQ Browser 10.4: Supported Baidu Browser 7.12: Supported KaiOS Browser 2.5: Supported Includes support for ArrayBuffer objects. Resources: MDN Web Docs - Typed arrays Polyfill for this feature is available in the core-js library...
Arrow functions behave differently from a regular function expressions in a few ways, as described in the MDN web documentation. In many cases, the array argument is not required and is not included as a parameter. Without the third argument, the inline function syntax is structured as follows...
These notes are not comprehensive, please refer to the excellent JS courses on Treehouse and the MDN documentation for more information. Happy to take in any feedback as well. JavaScript Accessing Elements Similar to Python, use the index operator on a list to access values using an index. No...
So in this post, we have seen how easy the JavaScript Filter method makes filtering elements in an array. Remember the example mentioned at the beginning of this post? Can you try to use the filter method to achieve the same thing?
it has become clear that there are times when it would be helpful for JavaScript code to be able to quickly and easily manipulate raw binary data. This is where typed arrays come in. Each entry in a JavaScript typed array is a raw binary value in one of a number of supported formats,...
For example, [`indexOf()`](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf) searches a value in the array and [`push()`](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/push) appends an element to the array. This makes Arrays a perfect candidate to represent...
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