![]() ![]() ![]() ![]() Check if a String Has a Certain Text Using the indexOf () Method in TypeScript The indexOf () method is used to check whether a string contains another string or not. Example Get your own TypeScript Server console. As originally stated, one of the problems is that TypeScript lacks the possibility to check if a value belongs to a superset of a generic parameter. TypeScript provides three methods that can be used to check whether a string contains a particular substring or text. ![]() You can edit TypeScript code and view the result in your browser. Start learning TypeScript now Examples in Each Chapter Our 'Try it Yourself' editor makes it easy to learn TypeScript. Try it Syntax includes(searchString) includes(searchString, position) Parameters searchString A string to be searched for within str. /root/src/node_modules/moduleB/package.json (if it specifies a types property) TypeScript is JavaScript with added syntax for types. The includes () method performs a case-sensitive search to determine whether one string may be found within another string, returning true or false as appropriate. You can use the Record utility type to define an object type for which the keys and values have a particular type.Module resolution is the process the compiler uses to figure out what an import refers to.Ĭonsider an import statement like import from "moduleB" in source file /root/src/moduleA.ts would result in the following lookups: The includes method will return true if the value is contained in the array and false otherwise. Please see the Modules documentation for more information. Check if an Object is contained in an Array in TypeScript Check if an Array contains a Value in TypeScript Use the includes () method to check if an array contains a value in TypeScript. This section assumes some basic knowledge about modules. ![]()
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