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Some cool javascript stuff
Posted by Erik on Jan 08 2006 @ 13:54 :: 3744 unique visits
First a nice usefull javascript statment which for some reason is deprecated in the latest javascript versions.The with statment allows you to execute code in another scope:
CODE: JAVASCRIPT
with (Math) {
var a = floor(12 / PI); // Instead of Math.floor and Math.PI
}
with (window.opener) {
...
}
var a = floor(12 / PI); // Instead of Math.floor and Math.PI
}
with (window.opener) {
...
}
The window.opener is usefull for popups to execute code in the scope of the opener's window (the base class for everything).
----------------------------------------------------------------------------------------------------------------------------------------------------
Because in javascript functions are first-class objects and javascript supports Closures we can do stuff like this:
CODE: JAVASCRIPT
function repeater(n) {
return function(w) {
for (var r = '', i = 0; i < n; i++) {
r += w;
}
return r;
}
}
var rep5 = repeater(5);
alert(rep5('a')); // will show aaaaa
return function(w) {
for (var r = '', i = 0; i < n; i++) {
r += w;
}
return r;
}
}
var rep5 = repeater(5);
alert(rep5('a')); // will show aaaaa
----------------------------------------------------------------------------------------------------------------------------------------------------
Another cool but almost never used feature of javascript is that you can toString() a function. This can be used to modify a function at runtime:
CODE: JAVASCRIPT
var foo = 1;
var bar = 2;
function test() {
return foo;
}
alert(test()); // will show 1
eval(test.toString().replace('foo', 'bar'));
alert(test()); // wil show 2
var bar = 2;
function test() {
return foo;
}
alert(test()); // will show 1
eval(test.toString().replace('foo', 'bar'));
alert(test()); // wil show 2
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2. On Jan 10 2006 @ 19:07 Erik wrote:
Note that the above (repeater) construction is called Currying.The example from the wikipedia article but now written in C++:
CODE: CPP
int plus(int x, int y) {
return x + y;
}
class curried_plus {
private:
int x;
public:
curried_plus(int _x) : x(_x) { ; }
int operator () (int y) const {
return plus(x, y);
}
};
curried_plus plus_one(1);
plus_one(2); // returns 3
return x + y;
}
class curried_plus {
private:
int x;
public:
curried_plus(int _x) : x(_x) { ; }
int operator () (int y) const {
return plus(x, y);
}
};
curried_plus plus_one(1);
plus_one(2); // returns 3
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1. On Jan 09 2006 @ 16:31 Erik wrote:
The repeater function can also be written in C++ by overloading the function application operator of a class called repeater:private:
int n;
public:
repeater(int _n) : n(_n) { ; }
std::string operator () (std::string w) const {
std::string r;
for (int i = 0; i < n; i++) {
r += w;
}
return r;
}
};
The usage is as followed:
printf(rep5("a").c_str()); // will print aaaaa