useArrayLiterals

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Diagnostic Category: lint/correctness/useArrayLiterals

JavaScript (and super languages)

Since: v1.7.2

Sources:

Same as: no-array-constructor
Same as: @typescript-eslint/no-array-constructor

Description

Disallow Array constructors.

Use of the Array constructor to construct a new array is generally discouraged in favor of array literal notation because of the single-argument pitfall and because the Array global may be redefined. The exception is when the Array constructor intentionally creates sparse arrays of a specified size by giving the constructor a single numeric argument.

Examples

Invalid

const xs = Array();

code-block.js:1:12 lint/correctness/useArrayLiterals  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Use an array literal instead of the Array constructor.
  
  > 1 │ const xs = Array();
      │            ^^^^^^^
    2 │ 
  
  ℹ The Array constructor is misleading because it can be used to preallocate an array of a given length or to create an array with a given list of elements.
  
  ℹ Unsafe fix: Use an array literal.
  
    1   │ - const·xs·=·Array();
      1 │ + const·xs·=·[];
    2 2 │

const xs = Array(0, 1, 2);

code-block.js:1:12 lint/correctness/useArrayLiterals  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Use an array literal instead of the Array constructor.
  
  > 1 │ const xs = Array(0, 1, 2);
      │            ^^^^^^^^^^^^^^
    2 │ 
  
  ℹ The Array constructor is misleading because it can be used to preallocate an array of a given length or to create an array with a given list of elements.
  
  ℹ Unsafe fix: Use an array literal.
  
    1   │ - const·xs·=·Array(0,·1,·2);
      1 │ + const·xs·=·[0,·1,·2];
    2 2 │

const xs = new Array(0, 1, 2);

code-block.js:1:12 lint/correctness/useArrayLiterals  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Use an array literal instead of the Array constructor.
  
  > 1 │ const xs = new Array(0, 1, 2);
      │            ^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ The Array constructor is misleading because it can be used to preallocate an array of a given length or to create an array with a given list of elements.
  
  ℹ Unsafe fix: Use an array literal.
  
    1   │ - const·xs·=·new·Array(0,·1,·2);
      1 │ + const·xs·=·[0,·1,·2];
    2 2 │

const xs = Array(...args);

code-block.js:1:12 lint/correctness/useArrayLiterals  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Use an array literal instead of the Array constructor.
  
  > 1 │ const xs = Array(…args);
      │            ^^^^^^^^^^^^^^
    2 │ 
  
  ℹ The Array constructor is misleading because it can be used to preallocate an array of a given length or to create an array with a given list of elements.
  
  ℹ Unsafe fix: Use an array literal.
  
    1   │ - const·xs·=·Array(...args);
      1 │ + const·xs·=·[...args];
    2 2 │

Valid

const xs = Array(65000);

const xs = [0, 1, 2];

How to configure

{
  "linter": {
    "rules": {
      "correctness": {
        "useArrayLiterals": "error"
      }
    }
  }
}