In the above lines, we are just using ‘interface’ keyword and defining the variable types inside it. Let’s see one sample example to understand the internal working of the function interface in TypeScript. This interface can be used to define the type of variable present inside the interface. substr () Returns the characters in a string beginning at the specified location through the specified number of characters. split () Splits a String object into an array of strings by separating the string into substrings. Inside this interface, we can define the type of array.īy using this we can define a type of array also we can define index type and value type as well. slice () Extracts a section of a string and returns a new string. Let’s see the types of interfaces available : 1. This provides the layer of abstraction inside the application. Also if we define any method inside the interface then its implementation should be provided by the class which is the implementation of that interface in the application. If you are new to typescript, then check. We will also discuss how to iterate over Map entries, Array map, clone and merge maps, merge map with an array, Convert Map Keys/Values to an Array, Weak Map, etc. The interface in general a contract between the application. This typescript tutorial explains TypeScript Map, how we can create a map in typescript, various map properties and methods. If we discuss it more general then we can use the same function to add, update or delete our data which is based on the same parameter. One of them is the function interface inside which we can define or declare our function signature which can be used later to have its body and implementation. How does Function Interface work in TypeScript?Īs we already know now that in TypeScript we can create different types of interfaces.
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