double function call javascript
//It means that the first function ($filter) returns another
//function and then that returned function is called immediately.
//For Example:
function add(x){
return function(y){
return x + y;
};
}
var addTwo = add(2);
addTwo(4) === 6; // true
add(3)(4) === 7; // trueCopyright © 2021 Codeinu
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