eslint/docs/src/rules/no-array-constructor.md

   1 ---
   2 title: no-array-constructor
   3 layout: doc
   4 rule_type: suggestion
   5 related_rules:
   6 - no-new-object
   7 - no-new-wrappers
   8 ---
   9
  10
  11 Use of the `Array` constructor to construct a new array is generally
  12 discouraged in favor of array literal notation because of the single-argument
  13 pitfall and because the `Array` global may be redefined. The exception is when
  14 the Array constructor is used to intentionally create sparse arrays of a
  15 specified size by giving the constructor a single numeric argument.
  16
  17 ## Rule Details
  18
  19 This rule disallows `Array` constructors.
  20
  21 Examples of **incorrect** code for this rule:
  22
  23 :::incorrect
  24
  25 ```js
  26 /*eslint no-array-constructor: "error"*/
  27
  28 Array(0, 1, 2)
  29
  30 new Array(0, 1, 2)
  31 ```
  32
  33 :::
  34
  35 Examples of **correct** code for this rule:
  36
  37 :::correct
  38
  39 ```js
  40 /*eslint no-array-constructor: "error"*/
  41
  42 Array(500)
  43
  44 new Array(someOtherArray.length)
  45
  46 [0, 1, 2]
  47 ```
  48
  49 :::
  50
  51 ## When Not To Use It
  52
  53 This rule enforces a nearly universal stylistic concern. That being said, this
  54 rule may be disabled if the constructor style is preferred.