using findIndex to check array of elements existed in array of objects - typescript

Question

I am trying to check from array of properties which are present in array of objects and which are not.

My object is like this:

var tempObj=[{id: '1', color: 'red, blue, green', age: 27},{id: '2', color: 'black, orange, yellow', age: 75}];
var tempColor = ['red', 'yellow', 'white'];

Here tempColor array contains three elements and I need to check these elements present in tempObj. Here in tempObj color property values are comma suppurated, so I am confusing here. Basically for single element check i used to do like this

var eleExists= this.tempObj.findIndex(obj => obj.age === 27) >= 0;

But for array elements to check with comma suppurated values don't have idea to check, so seeking for some help or guidance.

Alex Khristo · Accepted Answer · 2020-05-05 17:38:48Z

1

  const data = [
    {id: '1', color: 'red, blue, green', age: 27},
    {id: '2', color: 'black, orange, yellow', age: 75},
  ]

  const colors = ['red', 'yellow', 'white']

  function getNeverUsedColors(colors, data) {
    return colors.filter(color => !data.some(obj => obj.color.split(', ').includes(color)))
  }

  console.log(getNeverUsedColors(colors, data))
  // returns ['white']

edited May 5, 2020 at 17:38

answered May 5, 2020 at 16:09

Alex Khristo

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7 Comments

Roy Over a year ago

Here includes we may not use i think, If some other word contains red like tomotored, in this scenario conflicts may come right?

Alex Khristo Over a year ago

@Roy I updated the answer with solution that should fit your needs.

Roy Over a year ago

thanks for your time..but with above solution we cant find right which are existed and which are not?

Alex Khristo Over a year ago

@Roy it depends on what format you need to get the checking result e.g. dictionary { [id]: boolean }, or maybe an array of booleans, list of existed-only ids etc.

Alex Khristo Over a year ago

@Roy please specify the desired result.

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