Java Reference
In-Depth Information
return c * a + b;
Now a new function can be created by invoking this function and assigning the return value
to a variable:
toFahrenheit = closure();
This new function can then be invoked with its own argument, but the values of a and b
from the original function are still remembered:
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A Counter Example
Closures not only maintain the value of a variable from another function; this value can
also be subsequently changed. It can be used to create a counter() function that starts a
count using the variable i . It then returns a function that uses a closure to trap the value of
i , which can then be incremented every time the new function is invoked. The reference to
the variable i that is defined in the original function is maintained in the new function via
a closure:
function counter(start){
i = start;
return function() {
return i++;
var count = counter(1); // start a counter at 1
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