A utility function that can be used in .filter calls to remove undefined values and assert that the type is not longer undefined.
.filter
undefined
const arr: (number | undefined)[] = [1, 2, 3, undefined]; const filtered = arr.filter(notUndefined); // filtered = [1, 2, 3] and its type is number[] Copy
const arr: (number | undefined)[] = [1, 2, 3, undefined]; const filtered = arr.filter(notUndefined); // filtered = [1, 2, 3] and its type is number[]
The type that is not undefined.
The value to check.
A utility function that can be used in
.filtercalls to removeundefinedvalues and assert that the type is not longerundefined.Example