Ramda 或 ES6 - 在过滤对象数组后返回对象属性的值

Question

I want to return one of the properties of an object, if the value of another property matches a constant.

Examples:

// The Array
[
 {name: "Name1", description: "Name1 Description", enabled: true},
 {name: "Name2", description: "Name2 Description", enabled: false},
 {name: "Name3", description: "Name3 Description", enabled: false}
]

// The Constant
enum constant {
  Name1 = 'Name1',
  Name2 = 'Name2',
  Name3 = 'Name3'
}

// What I want to return
// Value of enabled property, for the matching object

This is the code I wrote:

const filterBasedOnToggle = (featureTogglesArray: IFeatureToggle[], featureToggle: Toggle): boolean[] => {
  return featureTogglesArray.filter((feature: IFeatureToggle) => feature.name === featureToggle).map(featureProperty => featureProperty.enabled);
};

This as you can see by the Typings, is returning an Array of Boolean value. I want to return the plain value. Any Ideas? Thank you!!

Answer 1

Didn't check if your code works, but as you said it returns a boolean array, so try using array.find to get the first match.

  const MATCH = featureTogglesArray.find((feature: IFeatureToggle) => feature.name === featureToggle);
  return MATCH === undefined ? false : MATCH.enabled;

Answer 2

Are you looking for something like this?

 const filterBasedOnToggle = (toggles) => (searchName) => { const feature = toggles .find (({name}) => name == searchName) || {} return feature .enabled } const featureToggles = [{name: "Name1", description: "Name1 Description", enabled: true}, {name: "Name2", description: "Name2 Description", enabled: false}, {name: "Name3", description: "Name3 Description", enabled: false}]; const enabledByName = filterBasedOnToggle (featureToggles); console .log (['Name1', 'Name2', 'Name3', 'Name4'] .map (enabledByName)) //~> [true, false, false, undefined]

This version uses find instead of filter to match on only the first one ... which was probably the signature issue with your version. It returns undefined if the value isn't matched, but you could easily make that false if you liked. You could of course write this with Ramda functions, but I don't see much there that would make this much simpler.