Higher order functions are functions which take other function as a parameter or return a function as a value. The function passed as a parameter is called callback.
A callback is a function which can be passed as parameter to other function.
Higher order function return a function as a value.
In the above example
welcome function is the higher order function, which returns
salutation function and which inturn returns
name function. finally we call
temp3 function which returns
Hello Mr. John.
Currying is a technique to convert a function with multiple arguments into a sequence of functions each with a single argument. In the previous snippet we’ve used
temp variables. But this will be a tedious process to get the result when the function is of
The same can be called by using currying technique as
welcome("Hello")("Mr.")("John") to get the same output.