useArrayLiterals
Diagnostic Category: lint/correctness/useArrayLiterals
Since: v1.7.2
Sources:
- Same as:
no-array-constructor - Same as:
@typescript-eslint/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
Section titled ExamplesInvalid
Section titled Invalidconst 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
Section titled Validconst xs = Array(65000);const xs = [0, 1, 2];