useArrayLiterals (since v1.7.2)

Diagnostic Category: lint/nursery/useArrayLiterals

Sources:

Same as: no-array-constructor

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

Array();

nursery/useArrayLiterals.js:1:1 lint/nursery/useArrayLiterals ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Don't use Array constructors.
  
  > 1 │ Array();
      │ ^^^^^^^^
    2 │ 
  
  ℹ Use of the Array constructor is not allowed except creating sparse arrays of a specified size by giving a single numeric argument.
  
  ℹ The array literal notation [] is preferable.

Array(0, 1, 2);

nursery/useArrayLiterals.js:1:1 lint/nursery/useArrayLiterals ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Don't use Array constructors.
  
  > 1 │ Array(0, 1, 2);
      │ ^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Use of the Array constructor is not allowed except creating sparse arrays of a specified size by giving a single numeric argument.
  
  ℹ The array literal notation [] is preferable.

new Array(0, 1, 2);

nursery/useArrayLiterals.js:1:1 lint/nursery/useArrayLiterals ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Don't use Array constructors.
  
  > 1 │ new Array(0, 1, 2);
      │ ^^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Use of the Array constructor is not allowed except creating sparse arrays of a specified size by giving a single numeric argument.
  
  ℹ The array literal notation [] is preferable.

Array(...args);

nursery/useArrayLiterals.js:1:1 lint/nursery/useArrayLiterals ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Don't use Array constructors.
  
  > 1 │ Array(...args);
      │ ^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Use of the Array constructor is not allowed except creating sparse arrays of a specified size by giving a single numeric argument.
  
  ℹ The array literal notation [] is preferable.

Valid

Array(500);

[0, 1, 2];