function getThis()( console.log(this) } getThis(); //returns Window {postMessage: ƒ, blur: ƒ, focus: ƒ, close: ƒ, frames: Window, ...} Listing 5-2Get the Current Context of a Function in the Global Scope 代码中调用函数的地方称为执行上下文。执行上下文决定了this 的值。注...
for(let character of text) { let count = this.letterCounts.get(character); // Get old count this.letterCounts.set(character, count+1); // Increment it this.totalLetters++; } } // Convert the histogram to a string that displays an ASCII graphic toString() { // Convert the Map to a...
一些对象的内置属性是无法被遍历到的,包括所有的内置方法,例如String对象的indexOf方法。不过,大部分的用户自定义属性都是可遍历的. 示例 例子: 使用for each...in 警告:永远不要使用for each...in语句遍历数组,仅用来遍历常规对象。这里讲解了为什么这么说。 下面的代码片段演示如何遍历一个对象的属性值,并计算它...
function howManyArgs() { alert(arguments.length); } howManyArgs("string", 45); //2 howManyArgs(); //0 howManyArgs(12); //1 另一个与参数相关的重要方面,就是 arguments 对象可以与命名参数一起使用,如下面的例子所示: 代码语言:javascript 代码运行次数:0 运行 复制 function doAdd(num1, num...
JavaScript example to Generate random string/characters. Submitted by Pratishtha Saxena, on May 28, 2022 We will discuss two methods for generating random strings. This string can be a simple character string or an alpha-numeric string. We will use JavaScript's Math.random() function to ...
You can use the backslash escape character \ to include special characters in your string. For example, // insert double quotes inside string let name = "My name is \"Peter\"."; console.log(name); Run Code Output My name is "Peter". In the above program, each \" inserts a double...
19.1 Use soft tabs (space character) set to 2 spaces. eslint: indent // bad function foo() { ∙∙∙∙let name; } // bad function bar() { ∙let name; } // good function baz() { ∙∙let name; }19.2 Place 1 space before the leading brace. eslint: space-before-...
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But instead of looping over the string, we’ll usetheString.prototype.split()methodto convert the string to an array. Then, we’ll usetheArray.prototype.filter()methodto create a new array of only unique characters. If the first matching character in the array has the sameindexas the cur...
Previous:Find the most frequent character in a string. Next:Reverse words in a given string. What is the difficulty level of this exercise? Based on 544 votes, average difficulty level of this exercise is Easy . Test your Programming skills with w3resource'squiz. ...