42 - Opiniões

Partial application and currying with Javascript In the strict way, currying is the technique of transforming a function that takes multiple arguments (a tuple of arguments) to one function that receive only one. In such way, currying techniques allow transform one multi-parameter function in a chain of functions, each one with a single argument. Looks complicated? Blah.. it is not true. In this little article, we are actually more interesting in partial applications. Let’s take the Mozilla Example for replace function in String. As we know, we can use a “replacer” function as paramenter for replace method in String object. Let’s say that we want to split a String defined by a non-numerical part, a numerical part and finally a non-alphanumeric part. Here is how: function replacer(match, p1, p2, p3, offset, string){ // p1 is nondigits, p2 digits, and p3 non-alphanumerics return [p1, p2, p3].join(' - '); }; We can try it as usual… var newString = "abc12345#$*%&q