For example, I have a example function, it has two parameters a and b.
var example = function(a, b){...}
Now I want to wrap this function, do some changes to parameter b, how can I get a in my wrap function?
example = _.wrap(example, function(original)){
//do some changes to b
....
original(?, b)//how can i get a
}
You will get the original parameter as arguments to the wrapper function in the same order as it was passed after the original function argument.
In the below example a and b will be the 2 parameters passed to the hello function.
var hello = function(p1, p2) {
return p1 + ": " + p2;
};
hello = _.wrap(hello, function(func, a, b) {
return "before, " + func(a, b + 'Name') + ", after";
});
snippet.log(hello('hellow', 'User'));<!-- Provides the `snippet` object, see http://meta.stackexchange.com/a/242144/134069 -->
<script src="http://tjcrowder.github.io/simple-snippets-console/snippet.js"></script>
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.4/underscore-min.js"></script>
