function printArray(arr) {var l = arr.length;for (var i = 0; i < l; i++) {print(arr[i]);}}关联数组永远不要使用 Array 作为 map/hash/associative 数组.数组中不允许使用非整型作为索引值, 所以也就不允许用关联数组. 而取代它使用 Object 来表示 map/hash 对象.Array 仅仅是扩展自 Object ...
* @param {Object=} opt_value Some value (optional). * @constructor */ function MyClass(opt_value) { /** * Some value. * @type {Object|undefined} * @private */ this.myValue_ = opt_value; } 这告诉编译器 myValue_ 可能是一个对象,或 null,或 undefined。 注意:可选参数 opt_value ...
In JavaScript,arraysusenumbered indexes. In JavaScript,objectsusenamed indexes. Arrays are a special kind of objects, with numbered indexes. When to Use Arrays. When to use Objects. JavaScript does not support associative arrays. You should useobjectswhen you want the element names to bestrings ...
永远不要用 Array 去做 map/hash/associative 要做的事情。 不允许使用关联 Arrays ……更具体的说是不允许使用非数字索引的数组(Array不都是用数字索引的么,也没办法用吧除非是两个数组同索引)。如果你需要一个map/hash那就用 Object 来代替 Array 吧,实际上你想用的就是 Object 而不是 Array。 Array 只是...
for...ofdoesn't provide the index linked to each object. However, if the object being iterated is indeed anArray(for..ofcan be used for other iterable types that may not have this functionality), the Array#entries method can be utilized to convert it into an array of [index, item] pa...
永远不要使用Array作为 map/hash/associative 数组. 数组中不允许使用非整型作为索引值, 所以也就不允许用关联数组. 而取代它使用Object来表示 map/hash 对象.Array仅仅是扩展自Object(类似于其他 JS 中的对象, 就像Date,RegExp和String)一样来使用.
永远不要使用Array作为map/hash/associative数组. 数组中不允许使用非整型作为索引值,所以也就不允许用关联数组.而取代它使用Object来表示map/hash对象. Array仅仅是扩展自Object (类似于其他JS中的对象,就像Date , RegExp和String )一 样来使用. 18.多行字符串 不要使用 不要这样写长字符串: var myString = ...
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There are no associative arrays (key-value pairs) in JS, you should use JSON strings instead. In JS, arrays and objects are very similar and often interchangeable. An object item can be referenced as an array item as well. In JS, items in objects are referenced with a fullstop “.”....
As there could be multiple elements that match the count, or even none, an array is returned. Thereducefunction creates an object that maps the unique items to their respective counts. We then identify the map entries with matching counts and return the unique items (keys) associated with the...