Comments (3)
Or something like this?
type NonEmptyArray<T> = [T, ...T[]];
function max<T>(array: NonEmptyArray<T>): T;
function max<T>(array: T[]): T | undefined;
function max<T>(array: T[]): T | undefined {
return (array && array.length)
? baseExtremum(array, identity, baseGt)
: undefined;
}
const foo = max([4, 2, 8, 6]) // number
const bar = max([]) // undefined
const baz = max([[]]) // never[] - I don't even know what that means ...
from lodash.
After much digging, I found a definition of max
, but I don't know if it is the only definition https://github.com/lodash/lodash/blob/4.0.1-npm-packages/lodash.max/index.js
from lodash.
Some kind of overload like
function max(array: []): undefined;
function max(array: number[]): number;
function max(array: number[]): number | undefined {
return (array && array.length)
? baseExtremum(array, identity, baseGt)
: undefined;
}
const foo = max([4, 2, 8, 6]) // is number
const bar = max([]) // is undefined
might work?
from lodash.
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from lodash.