How to compare nested array with regular array?

Question

I have these two arrays, one is a nested array and one is a regular array. both containing strings. I need to go through the regular array and assess if the elements match only the "claims" key and "matches" key but NOT the exclusions key. What is the best way of doing this ?

  const claimsArr = [
    {claim:'Protein',matches:['high in protein','^protein'],exclusions:['whey','milk']},
    {claim:'Carbs',matches:['high in carbs','^carbs'],exclusions:['sugar','lactose']},
     ]

  DomArray = [
        "Protein", "whey" , 
      ]

My desired output would be an array of matched items if the DomArray contains whats in "claim" && "matches" but not "exclusion"

expected output:

result = ["Protien", "whey", "high in protein" ,"protein"]

@ShuibAbdillahi can you add the expected output for the current input as array iteslf? — Nitheesh
– Nitheesh, Commented Jun 22, 2021 at 9:42

DSteman · Accepted Answer · 2021-06-22 10:07:42Z

1

const claimsArr = [
  {
    claim: "Protein",
    matches: ["high in protein", "^protein"],
    exclusions: ["whey", "milk"],
  },
  {
    claim: "Carbs",
    matches: ["high in carbs", "^carbs"],
    exclusions: ["sugar", "lactose"],
  },
];

const DomArray = ["Protein", "whey"];
const Result = [];
const data = claimsArr
  .map((x) => [x.claim, x.matches])
  .flat(2);

for (let i = 0; i < DomArray.length; i++) {
  if (data.includes(DomArray[i])) {
    Result.push(DomArray[i]);
  } else {
    continue;
  }
}

edited Jun 22, 2021 at 10:07

answered Jun 22, 2021 at 9:52

DSteman

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3 Comments

DSteman Over a year ago

Check Result for the outcome. I'm confident that less code is needed for this operation but it should do the job.

FZs Over a year ago

.flat().flat() could just be .flat(2)

DSteman Over a year ago

Ah nice, thanks for the feedback, made the adjustment

Akhil · Accepted Answer · 2021-06-22 11:08:56Z

1

You can use a mix of filter and includes functions of Array to achieve this.

const claimsArr = [
  {
    claim: 'Protein',
    matches: ['high in protein', '^protein'],
    exclusions: ['whey', 'milk'],
  },
  {
    claim: 'Carbs',
    matches: ['high in carbs', '^carbs'],
    exclusions: ['sugar', 'lactose'],
  },
];
const DomArray = ['Protein', 'whey'];

const isAMatch = (str) => DomArray.some(dom => str.toLowerCase().includes(dom.toLowerCase()))

const result = claimsArr.reduce((a, c) => {
  const matches = [c.claim, ...c.matches].filter(isAMatch);
  a.push(...matches);
  return a;
}, [])

console.log(result)

edited Jun 22, 2021 at 11:08

answered Jun 22, 2021 at 9:42

Akhil

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3 Comments

Shuib Abdillahi Over a year ago

hi , this is close. i've edited my question for the expected output

imran shoukat Over a year ago

Using flatMap and flat the desired output can be obtained.

imran shoukat Over a year ago

put this after filter: .flatMap( (item) => [item.claim, item.matches] ).flat()

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