README
@agen/filter
Filters (removes) individual items from parent async generator.
This method accepts the following parameters:
- generator - asynchronous generator providing inidvidual elements
- filter - method checking individual elements; if this method returns true then
this element appears in the resulting sequence; Filters gets two parameters:
- item to check
- current item index
It returns an asynchronous generator providing accepted elements.
Example 1: filtering by the element value
const batch = require('@agen/batch');
...
const list = [
'First Message',
'Hello world',
'Second Message',
'Hello John Smith'
]
for await (let item of filter(list, (v, i) => v.indexOf('Hello') >= 0)) {
console.log('-', item);
}
// Will print
// - Hello world
// - Hello John Smith
Example 2: filtering by the element index
const batch = require('@agen/batch');
...
const list = [
'item-0',
'item-1',
'item-2',
'item-3',
'item-4',
'item-5',
'item-6',
'item-7'
]
for await (let item of filter(list, (v, i) => i % 2 === 0)) {
console.log('-', item);
}
// Will print
// - item-0
// - item-2
// - item-4
// - item-6