no-array-constructor
NOTE: this rule is part of the
recommended rule set.Enable full set in
deno.json:{
"lint": {
"rules": {
"tags": ["recommended"]
}
}
}Enable full set using the Deno CLI:
deno lint --rules-tags=recommended
This rule can be explictly included to or excluded from the rules present in the current tag by adding it to the
include or exclude array in deno.json:{
"lint": {
"rules": {
"include": ["no-array-constructor"],
"exclude": ["no-array-constructor"]
}
}
}Enforce conventional usage of array construction.
Array construction is conventionally done via literal notation such as [] or
[1, 2, 3]. Using the new Array() is discouraged as is new Array(1, 2, 3).
There are two reasons for this. The first is that a single supplied argument
defines the array length, while multiple arguments instead populate the array of
no fixed size. This confusion is avoided when pre-populated arrays are only
created using literal notation. The second argument to avoiding the Array
constructor is that the Array global may be redefined.
The one exception to this rule is when creating a new array of fixed size, e.g.
new Array(6). This is the conventional way to create arrays of fixed length.
Invalid:
// This is 4 elements, not a size 100 array of 3 elements
const a = new Array(100, 1, 2, 3);
const b = new Array(); // use [] instead
Valid:
const a = new Array(100);
const b = [];
const c = [1, 2, 3];