'present' : 'absent'} in the sentence.`); 4.空字符串检查:includes() 认为空字符串是任何字符串(包括空字符串自身)的有效子字符串,因此对空字符串的检查总是返回 true。在检查字符串是否为空时,直接使用 str.length === 0 更为直观。 const str = ""; console.log(str.includes("")); // tru...
const isWordPresent = words.some(word => word.includes(wordToFind)); console.log(`The word "${wordToFind}" is ${isWordPresent ? 'present' : 'absent'} in the sentence.`); 4.空字符串检查:includes()认为空字符串是任何字符串(包括空字符串自身)的有效子字符串,因此对空字符串的检查总是返...
JavaScript String includes()用法及代码示例 JavaScript |字符串 includes() 方法 JavaScript 中的 String.includes() 方法用于检查字符串中是否存在该字符。如果字符串中存在字符,则该方法返回 True,否则返回 False。 该方法以不同的方式处理大写和小写字符。 用法: String.includes(search_character, startindex); 参...
JavaScript String includes() Method: Here, we are going to learn about the includes() method of the string in JavaScript with Example.
Example 1: Using includes() method letlanguages = ["JavaScript","Java","C","C++"]; // checking whether the array contains 'C'letcheck1 = languages.includes("C"); console.log(check1);// true // checking whether the array contains 'Ruby'letcheck2 = languages.includes("Ruby"); ...
Example 4:str = "My name is Tom"; subString = str.indexOf("Tom") !== -1; console.log(subString); Output:false JavaScript Examples »How do I remove a property from a JavaScript object? How can I remove a specific item from an array in JavaScript?
You can check if an element exists in an Array using this method. HOME Javascript Reference Array class reference Description You can check if an element exists in an Array using this method. It will return a Boolean value based on whether or not the element passed to it is a part ...
JavaScript Strings JavaScript String Methods JavaScript String Search Browser Support includes()is an ECMAScript6 (ES6) feature. ES6 (JavaScript 2015) is supported in all modern browsers since June 2017: Chrome 51Edge 15Firefox 54Safari 10Opera 38 ...
Example Let's take a look at an example of how to use the includes() method in JavaScript. For example: vartotn_string='TechOnTheNet';console.log(totn_string.includes('e')); In this example, we have declared a variable calledtotn_stringthat is assigned the string value of 'TechOnTh...
Example 1: Basic includes() usage with arrays constprogrammingLanguages=["JavaScript","Python","Ruby","Java","C++"];console.log(programmingLanguages.includes("Python"));// Output: true In this example, theincludes()method checks if the "Python" element is present in theprogrammingLanguagesarray...