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humanhighway/box-example.js

Created February 7, 2021 09:40
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  1. humanhighway created this gist Feb 7, 2021.
    11 changes: 11 additions & 0 deletions box-example.js
    View file
    Original file line number Diff line number Diff line change
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    const Box = (x) => ({
    map: f => Box(f(x)), // always return Box type.
    fold: (f) => f(x), // unwarp value
    })

    const result= Box(10)
    .map((x) => x * 2)
    .map((x) => x + 10)
    .fold(x => x);

    console.log(result);