useArrayLiterals
Summary
Section titled “Summary”- Rule available since:
v1.7.2 - Diagnostic Category:
lint/style/useArrayLiterals - This rule is recommended, which means is enabled by default.
- This rule has a safe fix.
- The default severity of this rule is information.
- Sources:
- Same as
no-array-constructor - Same as
@typescript-eslint/no-array-constructor
- Same as
Description
Section titled “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
Section titled “Examples”Invalid
Section titled “Invalid”const xs = Array();code-block.js:1:12 lint/style/useArrayLiterals FIXABLE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
ℹ 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 Safe 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/style/useArrayLiterals FIXABLE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
ℹ 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 Safe 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/style/useArrayLiterals FIXABLE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
ℹ 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 Safe 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/style/useArrayLiterals FIXABLE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
ℹ 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 Safe fix: Use an array literal.
1 │ - const·xs·=·Array(...args);
1 │ + const·xs·=·[...args];
2 2 │
const xs = new Array<number>()code-block.ts:1:12 lint/style/useArrayLiterals FIXABLE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
ℹ Use an array literal instead of the Array constructor.
> 1 │ const xs = new Array<number>()
│ ^^^^^^^^^^^^^^^^^^^
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 Safe fix: Use an array literal.
1 │ - const·xs·=·new·Array<number>()
1 │ + const·xs:·number[]·=·[]
2 2 │
const xs = Array(65000);const xs = [0, 1, 2];How to configure
Section titled “How to configure”{ "linter": { "rules": { "style": { "useArrayLiterals": "error" } } }}