//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(letk
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 Object.fromEntries() String.prototype.{trimStart,trimEnd} Symb...
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...
迭代Map let recipeMap = new Map([['cucumber', 500],['tomatoes', 350],['onion', 50]]);// iterate over keys (vegetables)for (let vegetable of recipeMap.keys()) {alert(vegetable); // cucumber, tomatoes, onion}// iterate over values (amounts)for (let amount of recipeMap.values())...
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...
};// 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'} ...
val.filter(Boolean):val;// Reduce the object to a compacted version, removing falsy values recursivelyreturnObject.keys(data).reduce((acc,key)=>{constvalue=data[key];// Check if the value is truthy before including it in the resultif(Boolean(value))// Recursively compact object values, if...
[name, field] of Object.entries(document.fields)) { console.log( `Field ${name} has content '${field.content}' with a confidence score of ${field.confidence}`, ); } } console.log("Pages:"); for (const page of pages || []) { console.log(`Page number: ${page.pageNumber} ($...
Theiterator protocoldefines how to produce asequence of valuesfrom an object. An object becomes aniteratorwhen it implements anext()method. Thenext()method must return an object with two properties: value (the next value) done (true or false) ...
Thesome()method checks if some array values pass a test. This example checks if some array values are larger than 18: Example constnumbers = [45,4,9,16,25]; letsomeOver18 = numbers.some(myFunction); functionmyFunction(value, index, array) { ...