no-octal
NOTE: this rule is part of the
recommended rule set.Enable full set in
deno.json:{
"lint": {
"tags": ["recommended"]
}
}Enable full set using the Deno CLI:
deno lint --tags=recommended
Disallows expressing octal numbers via numeric literals beginning with 0.
Octal numbers can be expressed via numeric literals with leading 0 like 042,
but this expression often confuses programmers. That's why ECMAScript's strict
mode throws SyntaxError for the expression.
Since ES2015, the other prefix 0o has been introduced as an alternative. This
new one is always encouraged to use in today's code.
Invalid:
const a = 042;
const b = 7 + 042;
Valid:
const a = 0o42;
const b = 7 + 0o42;
const c = "042";