filter - nodef/extra-string GitHub Wiki
Filter characters that pass the test, like Array.filter().
const filter = require('@extra-string/filter');
// filter(<string>, <testFn>, [thisArg])
filter('g00df00d', (v) => v<='f');
// '00df00d'
filter('badfood', (v) => v<='f');
// 'badfd'
filter('', (v) => v<='f');
// ''