Function assert

Tests a sequence with a given predicate. An error will be thrown if any element fails the sequence.

Example

const items = [1, 2, '3'];
const sum = from(items).assert(x => typeof x === 'number').sum(); // throws due to '3'

Typeparam

TSource The type of source elements.

Returns

A sequence with source elements in their original order.

Tests a sequence with a given predicate. An error will be thrown if any element fails the sequence.

Example

const items = [1, 2, '3'];
const sum = from(items).assert(x => typeof x === 'number', 'Should be number').sum(); // throws due to '3'

Typeparam

TSource The type of source elements.

Returns

A sequence with source elements in their original order.

Tests a sequence with a given predicate. An error will be thrown if any element fails the sequence.

Example

class MyError extends Error {}
const items = [1, 2, '3'];
const sum = from(items).assert(x => typeof x === 'number', MyError).sum(); // throws instance of MyError due to '3'

Typeparam

TSource The type of source elements.

Typeparam

TError The type of error to be thrown.

Returns

A sequence with source elements in their original order.

Tests a sequence with a given predicate. An error will be thrown if any element fails the sequence.

Example

class MyError extends Error {}
const items = [1, 2, '3'];
const sum = from(items).assert(x => typeof x === 'number', 'Must be number', MyError).sum(); // throws instance of MyError with message due to '3'

Typeparam

TSource The type of source elements.

Typeparam

TError The type of error to be thrown.

Returns

A sequence with source elements in their original order.