javascript - 在 Ramda 中有条件地添加和重命名属性，无需使用镜头

Question

我需要修复 ramda.js 中对象的属性。我不想使用镜头。

拥有我需要的以下数据:

如果 a 和 b 中的数组属性中的对象以及其他

• 没有属性“animationTimingFunction”，添加属性键“easing”，值为ease

• 确实有属性“animationTimingFunction”，将此属性重命名为“easing”并保持值不变。

输入数据:

let data = {
    "a": [{
        "opacity": "1",
        "offset": "0"
    }, {
        "opacity": "0",
        "offset": "0.25",
        "animationTimingFunction": "linear"
    }, {
        "opacity": "1",
        "offset": "0.5"
    },
    "b": [{
        "transform": "scale3d(1, 1, 1)",
        "offset": "0"
    }, {
        "transform": "scale3d(1.05, 1.05, 1.05)",
        "offset": "0.5"
    }, {
        "transform": "scale3d(1, 1, 1)",
        "offset": "1"
    }]
};

输出应该是:

let data = {
    "a": [{
        "opacity": "1",
        "offset": "0",
        "easing": "ease"
    }, {
        "opacity": "0",
        "offset": "0.25",
        "easing": "linear"
    }, {
        "opacity": "1",
        "offset": "0.5",
        "easing": "ease"
    },
    "b": [{
        "transform": "scale3d(1, 1, 1)",
        "offset": "0",
        "easing": "ease"
    }, {
        "transform": "scale3d(1.05, 1.05, 1.05)",
        "offset": "0.5",
        "easing": "ease"
    }, {
        "transform": "scale3d(1, 1, 1)",
        "offset": "1",
        "easing": "ease"
    }]
};

作为开始，我已经尝试过，但我错过了条件部分:

    let convertEasing = (data) =>{
        let convert = data => R.assoc('easing', 'linear');
        let result = R.map(R.map(convert(data)), data)
        return result;
    };

Answer 1

就这样怎么样

const alter = obj => {
  const ease = prop('animationTimingFunction', obj) || 'ease';
  return dissoc('animationTimingFunction', assoc('easing', ease, obj));
}

map(map(alter))(data);

如果您愿意，您可以免积分:

const alter = pipe(
  chain(
    assoc('easing'),
    pipe(prop('animationTimingFunction'), defaultTo('ease')),
  ),
  dissoc('animationTimingFunction')
)

但在我看来，这会失去可读性。

您可以看到either version在 Ramda REPL 上。