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
//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...
keys()is not supported in Internet Explorer. JavaScript Array entries() Example Create an Array Iterator, and then iterate over the key/value pairs: constfruits = ["Banana","Orange","Apple","Mango"]; constf = fruits.entries(); for(letx of f) { ...
Type Description An array An Array Iterator object containing the keys of an array.More ExamplesExample Iterate directly over the iterator: // Create an Array const fruits = ["Banana", "Orange", "Apple", "Mango"]; // List the Keys let text = ""; for (let x of fruits.keys()) { ...
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() ...
The `listDocumentModels` method will only // iterate over model summaries, which do not include detailed schema information. Schema information is only returned // from `getDocumentModel` as part of the full model information. const models = client.listDocumentModels(); let i = 1; for await...
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...
to iterate over arrays, and Object.keys() / Object.values() / Object.entries() to produce arrays so you can iterate over objects. const numbers = [1, 2, 3, 4, 5]; // bad let sum = 0; for (let num of numbers) { sum += num; } sum === 15; // good let sum = 0; ...
100*e}（2）连等连等是利用赋值运算表达式会返回所赋的值，并且执行顺序是从右到左的，如下：over...
Iterate over array elements or object key-value pairs. Returning false from the iterator function stops the iteration. $.each(['a', 'b', 'c'], function(index, item){ console.log('item %d is: %s', index, item) }) var hash = { name: 'zepto.js', size: 'micro' } $.each(hash...