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Lambda Function/Arrow Function - The arrow function is additional feature in typescript and it is also known as a lambda function. Stayed Informed – Learn Angular 2 with TypeScript A lambda function is a function without a name. var addNum = (n1: number , n2: number ) => n1 + n2; In the above, the “=>” is a lambda operator and (n1 + n2) is the body of the function and (n1: number , n2: number ) are inline parameters. For example – let addNum = (n1: number , n2: number ) : number => { return n1 + n2; } let multiNum = (n1: number , n2: number ) : number => { return n1 * n2; } let dividNum = (n1: number , n2: number ) : number => { return n1 / n2; } addNum( 10 , 2 ); // Result - 12 multiNum( 10 , 2 ); // Result - 20 multiNum( 10 , 2 ); // Result - 5 I hope you are enjoying with this post! Please share with you friends. Thank you!!