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1. Road to monad: apply Road to monad: apply

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   import { Option, some, none, option } from "fp-ts/lib/Option";

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   import { liftA4 } from 'fp-ts/lib/Apply';

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   import { Function1 } from 'fp-ts/lib/function';

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   // Task: find the total age of two users

2. Road to monad: functor Road to monad: functor

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   import { Function1 } from 'fp-ts/lib/function';

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   import { Option, none, some } from 'fp-ts/lib/Option';

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   // T -> T

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   const identity = <T>(v: T): T => v;

3. Road to monad: final Road to monad: final

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   import { some, Option, none, getSetoid, option } from 'fp-ts/lib/Option';

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   import { setoidNumber } from 'fp-ts/lib/Setoid';

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   import { liftA2 } from 'fp-ts/lib/Apply';

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   const isEquals = (x: Option<number>, y: Option<number>) => getSetoid(setoidNumber).equals(x, y);

4. Road to monad: applicative and chain... Road to monad: applicative and chain (+setoid)

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   import { Option, some, none, fromNullable, getSetoid as getSetoidOpt } from 'fp-ts/lib/Option';

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   import { success, getSetoid as getSetoidRD } from '@devexperts/remote-data-ts';

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   import { of, Observable, combineLatest } from 'rxjs';

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   import { setoidNumber, setoidString, getRecordSetoid } from 'fp-ts/lib/Setoid';

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   import { Function1 } from 'fp-ts/lib/function';

5. devexperts/dx-platform devexperts/dx-platform Public

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