Explanation for index and value inputs to anonymous function in javascript -


i have question on how anonymous functions work in javascript. saw beautiful piece of code toggle "disabled" html element [from post link stack overflow ]:

$('#el').prop('disabled', function(i, v) { return !v; });

the inputs anonymous function , v index , value.

why that? because of .prop() or somehow property of anonymous functions? there other inputs available? thanks

solution: answer question in docs .prop() api.jquery.com/prop/:

enter image description here

it's how jquery .prop() method implemented. if sees second parameter function, calls function each matched element, passing element index , attribute value.

inventing api in javascript involves making decisions situations involving callback api clients use. there no hard-and-fast rules in general, though contexts have conventions should followed when possible. example node world, it's common callbacks passed 2 arguments, (possibly null) error , data relevant operation.


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