在 ES6 中引入的for...of循环,以替代for...in和forEach(),并支持新的迭代协议。for...of允许你遍历 Arrays(数组), Strings(字符串), Maps(映射), Sets(集合)等可迭代的数据结构等。 语法 for(variable ofiterable) { statement } variable:每个迭代的属性值被分配给该变量。 iterable:一个具有可枚举属性...
We sort an array of integers and strings in descending order. $ node main.js 8 7 6 5 3 1 0 -1 -2 -3 sky nord new lemon cup blue JS array sort strings case insensitive To compare strings in a case insensitive manner, we call thetoLowerCasefunction on the compared elements. main.j...
JavaScript is a powerful and versatile programming language, allowing developers to manipulate and interact with various data types, such as strings and arrays. One of the most common tasks you may encounter while working with these data types is checking whether an element or a substring is prese...
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 use objects when you want the element names to be strings (text). You should use arrays when you want the element names to be ...
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 (text). You should usearrayswhen you want the element names to benumbers. ...
Javascript的直接量包括:字符串(strings)、数字(numbers)、布尔值(booleans)、对象(objects)、数组(arrays)、函数(functions)、正则表达式(regular expressions),具有特殊意义的空值(null),以及未定义(undefined)。 Variables 变量 开发人员用var关键字创建用于存储数据值。
4.1 关联数组的对象 Objects as Associative Arrays 对于对象,其属性相当于已命名的字符串值的一个集合。可以使用数组存取运算符[]来提取属性。 对象可以使用"."来存取一个对象属性,而数组更常用的存取属性运算符是[].下面两个表达式等效: 1 object.property ...
()" constructor. Each array element has an index, allowing you to access them directly. JavaScript provides many built-in functions forcontaining,reducing,reversing,merging,joining,slicing,cloning, copying,clearing, andinsertingarrays. You can also get asumof array elements and convert anarray to ...
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In programming languages, concatenation means joining strings end-to-end. Concatenation "snow" and "ball" gives "snowball". Concatenating arrays means joining arrays end-to-end. JavaScript Array concat() Theconcat()method creates a new array by merging (concatenating) existing arrays: ...