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The following code will show you how to create a function ‘revocable’ that will be used to grant/revoke access to other functions.
The function that will be tested here is the add function to add 2 numbers. But the ‘revocable’ function is good enough to work for other functions as well.
function add (x, y) {
return x + y;
}
Given below is the code for the ‘revocable’ function:
function revocable(fn) {
var allow = true;
return {
invoke: function() {
if(!allow) {
throw new Error('Access revoked');
}
return fn.apply(this, arguments);
},
revoke: function() {
allow = false;
},
grant: function() {
allow = true;
}
}
}
var temp = revocable(add);
temp.invoke(3, 4); // 7
temp.revoke();
temp.invoke(3, 4); // Uncaught Error: Access revoked(…)
temp.grant();
temp.invoke(3, 4); // 7