Check if a string includes "world": lettext ="Hello world, welcome to the universe."; letresult = text.includes("world"); Try it Yourself » More examples below. Description Theincludes()method returnstrueif a string contains a specified string. ...
Use the includes() method to search for a substring inside a string: var word = "bravery"; console.log(word.includes(“rave”)); // true Copy Syntax This quick and easy way to check if one string contains another is very simple to implement. Just call the method with the substring ...
The includes() method checks if one string can be found inside another string. Example const message = "JavaScript is fun"; // check if message includes the string "Java" let result = message.includes("Java"); console.log(result); // Output: true Run Code includes() Syntax The ...
A: Theincludes()method is case-sensitive. However, you can make it case-insensitive with the help oftoLowerCase()ortoUpperCase()methods. Convert both the main string and the substring to lower or upper case before usingincludes(). constsentence="Welcome to codedamn!";constword="CODEDAMN";c...
Thesubstring()method does not change the original string. If start is greater than end, arguments are swapped: (4, 1) = (1, 4). Start or end values less than 0, are treated as 0. See Also: The split() Method The slice() Method ...
Here, the code message[1] gives us the character at index 1 of the message string, i.e., its second character. 2. Using the charAt() Method Another way is to supply the position of the character to the charAt() method. For example, let message = "hello"; // use charAt(1) to ...
The split() Method The slice() Method The substring() Method Syntax string.substr(start, length) Parameters Parameter Description start Required.The start position.First character is at index 0. If start is greater than the length, substr() returns "".If start is negative, substr() counts ...
You can also use this property to check whether a character or string of characters is inside of a string using this method. If the character or string is not inside of the string the return will be -1 var myName = "My Name is Nick Coughlin"myName.indexOf("Max")//-1 And therefore...
A JavaScript object's default toString is [object Object], so we can get our letter o by using the second element of the string Object. ([]+{})[++[[]][+[]]]//"o" Each JavaScript object has a toString method which is called when the object is converted to a string. Using our ...
var includesStr = 'abcdefg' var includesEle1 = includesStr.includes('a') var includesEle2 = includesStr.includes('z') console.log(includesEle1) // -> true console.log(includesEle2) // -> false复制代码 startsWith(searchvalue, start): 表示是否字符(串)位于string的头部位置, 如果是返回 tr...