Example of currifying functions in JavaScript

curry.js

//The function we're gonna currify
let extractEmotion = function( media, callback ) {
	console.log( 'This is extractEmotions' );
	callback( media );
};

//The previous function receives a callback
let test = function( media ) {
	console.log( 'I\'m the callback and I\'ve received ' + media );
};

extractEmotion( 'Holi', test );
//Output:
//This is extractEmotions
//I'm the callback and I've received Holi

//This function returns a function which called the function passed as an argument (extractEmotions)
//with its parameters, but this time the second argument, the callback, is set to the callback we pass to curryFunction
//as second argument
function curryFunction( func, callback ) {
	return function( media ) {
		func( media, callback );
	};
}
//We reassign the callback to make sure that the output is the expected one
test = function( media ) {
	console.log( 'I\'m the callback in curry and I\'ve received ' + media );
};

extractEmotion = curryFunction( extractEmotion, test );
//Now extractEmotion only receives one argument. The callback, which was the second argument, was already set in curryFunction
extractEmotion( 'Holi' );
//Output:
//This is extractEmotions
//I'm the callback in curry and I've received Holi