JavaScript Functional JavaScript Higher-Order Functions
Example
In general, functions that operate on other functions, either by taking them as arguments or by returning them (or both), are called higher-order functions.
A higher-order function is a function that can take another function as an argument. You are using higher-order functions when passing callbacks.
function iAmCallbackFunction() {
console.log("callback has been invoked");
}
function iAmJustFunction(callbackFn) {
// do some stuff ...
// invoke the callback function.
callbackFn();
}
// invoke your higher-order function with a callback function.
iAmJustFunction(iAmCallbackFunction);
A higher-order function is also a function that returns another function as its result.
function iAmJustFunction() {
// do some stuff ...
// return a function.
return function iAmReturnedFunction() {
console.log("returned function has been invoked");
}
}
// invoke your higher-order function and its returned function.
iAmJustFunction()();
