tomatoes, onion}// iterate over values (amounts)for (let amount of recipeMap.values()) {alert(amount); // 500, 350, 50}// iterate over [key, value] entriesfor (let entry of recipeMap) { // the same as of recipe
We can easily loop over the key, values, and key/value pairs with for/of form. looping.js let stones = new Map(); stones.set(0, "citrine"); stones.set(1, "garnet"); stones.set(2, "topaz"); stones.set(3, "opal"); stones.set(4, "amethyst"); for (const entry of stones)...
//映射对象集合到特定的属性名称的生成器。function*iteratePropertyValues(collection, property) {for(letobjectofcollection) {yieldobject[property]; } }//生成给定对象的每个值的生成器。function*iterateObjectValues(collection) {for(letkeyofObject.keys(collection)) {yieldcollection[key]; } }//生成给定数组...
Create an Array Iterator, and then iterate over the key/value pairs: constfruits = ["Banana","Orange","Apple","Mango"]; constf = fruits.entries(); for(letx of f) { document.getElementById("demo").innerHTML+= x; } Try it Yourself » ...
};// create object literals for the different sizesvarsmall = {getPrice:function(){returnthis.basePrice+2},getLabel:function(){returnthis.name+' small'} };varmedium = {getPrice:function(){returnthis.basePrice+4},getLabel:function(){returnthis.name+' medium'} ...
JavaScript 语言是在 1994 年创建的,旨在使 Web 浏览器显示的文档具有动态行为。自那时以来,该语言已经发生了显著的演变,与此同时,Web 平台的范围和功能也迅速增长。今天,JavaScript 程序员可以将 Web 视为一个功能齐全的应用程序开发平台。Web 浏览器专门用于显示格式化文本和图像,但是,像本机操作系统一样,浏览器还...
用戶端可以使用具有資源的 API 金鑰的 ,AzureKeyCredentialTokenCredential也可以使用 Azure Active Directory RBAC 來授權用戶端。 可以在 Azure 門戶中 或使用下面的 Azure CLI 代碼片段找到表單識別器資源的終結點: Bash 複製 az cognitiveservices account show --name <your-resource-name> --resource-group <...
Use Object.keys() and Array.prototype.reduce() to iterate over each key with an appropriate initial value. Use Boolean to determine the truthiness of each key's value and add it to the accumulator if it's truthy. Use typeof to determine if a given value is an object and call the func...
function* iterateObjectValues(collection) { for (let key of Object.keys(collection)) { yield collection[key]; } } //生成给定数组中每个项的生成器。 function* iterateArrayElements(collection) { for (let element of collection) { yield element; } } 这些函数简洁小巧,易于使用。麻烦的是这些函数...
Object.values() Object.entries() Object.getOwnPropertyDescriptors() 尾逗号 共享内存 and 原子操作 ES2018 Rest/Spread Properties Asynchronous iteration Promise.prototype.finally() 正则表达式改进 ESNext Array.prototype.{flat,flatMap} try/catch 可选的参数绑定 ...