eslint/docs/src/rules/no-caller.md

   1 ---
   2 title: no-caller
   3 rule_type: suggestion
   4 ---
   5
   6
   7 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.
   8
   9 ```js
  10 function foo() {
  11     var callee = arguments.callee;
  12 }
  13 ```
  14
  15 ## Rule Details
  16
  17 This rule is aimed at discouraging the use of deprecated and sub-optimal code by disallowing the use of `arguments.caller` and `arguments.callee`. As such, it will warn when `arguments.caller` and `arguments.callee` are used.
  18
  19 Examples of **incorrect** code for this rule:
  20
  21 ::: incorrect
  22
  23 ```js
  24 /*eslint no-caller: "error"*/
  25
  26 function foo(n) {
  27     if (n <= 0) {
  28         return;
  29     }
  30
  31     arguments.callee(n - 1);
  32 }
  33
  34 [1,2,3,4,5].map(function(n) {
  35     return !(n > 1) ? 1 : arguments.callee(n - 1) * n;
  36 });
  37 ```
  38
  39 :::
  40
  41 Examples of **correct** code for this rule:
  42
  43 ::: correct
  44
  45 ```js
  46 /*eslint no-caller: "error"*/
  47
  48 function foo(n) {
  49     if (n <= 0) {
  50         return;
  51     }
  52
  53     foo(n - 1);
  54 }
  55
  56 [1,2,3,4,5].map(function factorial(n) {
  57     return !(n > 1) ? 1 : factorial(n - 1) * n;
  58 });
  59 ```
  60
  61 :::