Filter objects in an array based on regex applied to property-CodePudding

I have this data structure:

const data = [
  {
    id: "1",
    name: "first item",
    T1_something: 21,
    T1_anotherthing: 15,
    T1_hello: 98,
    T2_coding: 12.3,
    T2_world: 4.1,
    T2_different: 2.5
  },
  {
    id: "2",
    name: "second item",
    T1_something: 3,
    T1_anotherthing: 12.6,
    T1_hello: 64.1,
    T2_coding: 71.3,
    T2_world: 4.5,
    T2_different: 3.3
  }
];

I want to get only properties where the property name matches the following regex /^T\d/

So my desired output is this:

const desiredResult = [
  {
    T1_something: 21,
    T1_anotherthing: 15,
    T1_hello: 98,
    T2_coding: 12.3,
    T2_world: 4.1,
    T2_different: 2.5
  },
  {
    T1_something: 3,
    T1_anotherthing: 12.6,
    T1_hello: 64.1,
    T2_coding: 71.3,
    T2_world: 4.5,
    T2_different: 3.3
  }
];

How do I go about doing this filtering based on a regex in an array of objects?

CodePudding user response：

const data = [
  {
    id: "1",
    name: "first item",
    T1_something: 21,
    T1_anotherthing: 15,
    T1_hello: 98,
    T2_coding: 12.3,
    T2_world: 4.1,
    T2_different: 2.5
  },
  {
    id: "2",
    name: "second item",
    T1_something: 3,
    T1_anotherthing: 12.6,
    T1_hello: 64.1,
    T2_coding: 71.3,
    T2_world: 4.5,
    T2_different: 3.3
  }
];

const filterBasedOnProp = (elements, pattern) => {
  const regex = new RegExp(pattern)
  
  return elements.map((element) => Object.keys(element).reduce((accumulator, key) => {
    if (key.match(regex)) accumulator[key] = element[key]
    
    return accumulator
  }, {}))
}

console.log(filterBasedOnProp(data, "^T"))

CodePudding user response：

My solution

const desiredResult = data.map(o=>{
    const newO={};
    Object.keys(o).filter(oKey=>/^T\d/.test(oKey)).forEach(oKey=>{
        newO[oKey]=o[oKey]
    })

    return newO;
})

CodePudding user response：

// const data = ...
// const regexp = ...

function filterMyDataProperties(data, regexp) {
  return data.map(item => {
    return Object.keys(item).reduce((newItem, key) => {
      if (regexp.test(key)) {
        newItem[key] = item[key]
      }
  
      return newItem
    }, {})
  })
}

const result = filterMyDataProperties(data, regexp);