rxjs-toolkit examples

propsAreTruthy.ts

import { from } from 'rxjs';
import { propsAreTruthy, tapLog } from 'rxjs-toolkit';

const topLevelTruthy = {
  one: 'I',
  two: 'am', 
  three: 'truthy',
  iHaveNestedProps: { // top level also truthy
    nested: null,
  },
};

const oneFalsyProp = {
  one: 'I',
  am: '',
  three: 'falsy',
};

from([
  topLevelTruthy, 
  oneFalsyProp,
]).pipe(
  propsAreTruthy(),
  /**
   * by default, all top level properties are checked for truthiness
   * the first signal will come through as is
   * all of it's top level props are truthy (one, two, three, iHaveNested)
   * the next signal has a falsy prop, 'am', it's an empty string
   * that signal will get mapped to false
   */
  tapLog(),
  /**
   * { one: 'I', two: 'am', three: 'truthy' iHaveNestedProps: { nested: null } }
   * false
   */
).subscribe();