arguments.caller or arguments.callee should not be used JS-0053
Performance
Minor
5 months ago
—
2 years old
Avoid arguments.callee
1438 source[property].constructor === Object
1439 ) {
1440 destination[property] = destination[property] || {};
1441 arguments.callee(destination[property], source[property]);1442 } else {
1443 destination[property] = source[property];
1444 }
Description
The use of arguments.caller and arguments.callee make several code optimizations impossible.
They have been deprecated in future versions of JavaScript and their use is forbidden in ECMAScript 5 while in strict mode.
Bad Practice
function foo(n) {
if (n <= 0) {
return;
}
arguments.callee(n - 1);
}
[1,2,3,4,5].map(function(n) {
return !(n > 1) ? 1 : arguments.callee(n - 1) * n;
});
Recommended
function foo(n) {
if (n <= 0) {
return;
}
foo(n - 1);
}
[1,2,3,4,5].map(function factorial(n) {
return !(n > 1) ? 1 : factorial(n - 1) * n;
});