Ionic 3 cannot convert filter() result into array

Question

I have the initial array of data dataToDisplay and the array that I need to add filtered arrays into it dataToDisplay. I used .filter() to do so:

this.dataToDisplay = this.dataToDisplay.filter((res)=>{
  console.log(res);
  if(res.type==this.filterArray['typeOfIns'])
  {
    this.dataToFilter = res;
    console.log(this.dataToFilter)

    //this.dataToFilter = res;
    //console.log(this.dataToFilter)
  }

})

I got an error saying:

ERROR Error: Error trying to diff '[object Object]'. Only arrays and iterables are allowed

The result at line 58: console.log(this.dataToFilter) is returning the right arrays but cannot be displayed and binded into the page.

dataToDisplay is having the following structure:

dataToDisplay = [
    {id:.., type:.., name:..},
    {id:.., type:.., name:..}
]

can you share dataToDisplay? and generally add more context as its unclear what is array and what is array of arrays? — Sergey Rudenko
– Sergey Rudenko, Commented Apr 25, 2019 at 20:17
The callback of the filter method should return a boolean. It seems you do not return a boolean there. Maybe check out how filter works — Phonolog
– Phonolog, Commented Apr 26, 2019 at 12:11
It worked as @Phonolog links said, just a simple return is enough, I will post an edit. — alim1990
– alim1990, Commented Apr 27, 2019 at 6:23

Kishan Bharda · Accepted Answer · 2019-04-28 01:32:22Z

1

Please try below code :

this.dataToDisplay = this.dataToDisplay.filter((res)=>{
  return res.type==this.filterArray['typeOfIns']
})

This will done all the work.

answered Apr 28, 2019 at 1:32

Kishan Bharda

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