trying to create an array of objects given 2 arrays + map

Question

I have the following 2 arrays here:

  > chNameArr
[ 'chanel1',
  'chanel2',
  'chanel3',
  'chanel4',
  'chanel5',
  'chanel6',
  'chanel7' ]

and here:

   > a
[ 'channelName'
  'status',
  'connections',
  'socketIds',
  'lastRun',
  'numberOfRuns',
  'timeout' ]

what I am trying to achieve is the following objects per channel in an array where channelName from a get the value from chNameArr but the rest of 'a' gets an empty string

 file=[{"channelName":"chanel1","status":"", "connections":"", "socketIds":"", "lastRun":"", "numberOfRuns":"", "timeout":""},
 .
 .
 .
        {"channelName":"chanel7","status":"", "connections":"", "socketIds":"", "lastRun":"", "numberOfRuns":"", "timeout":""}]

this is my attempt

   > chNameArr.map(function(d){return {channelName:d}})
[ { channelName: 'chanel1' },
  { channelName: 'chanel2' },
  { channelName: 'chanel3' },
  { channelName: 'chanel4' },
  { channelName: 'chanel5' },
  { channelName: 'chanel6' },
  { channelName: 'chanel7' } ]

So what's the problem? Do you know how to iterate over an array? And how to add properties to an object? That's the only thing you'd need to know... — Felix Kling
– Felix Kling, Commented Sep 22, 2015 at 0:57

Alex Hall · Accepted Answer · 2015-09-22 00:44:55Z

2

chNameArr.map(function(d) {
  result = {};
  result[a[0]] = d;
  for (var i=1; i<a.length; i++) {
    result[a[i]] = "";
  }
  return result;
})

There is no one-liner to solve this problem in general, although if you don't actually need to use the array a you could manually construct {channelName:d, status: "", ...} in your original map.

answered Sep 22, 2015 at 0:44

Alex Hall

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1 Comment

HattrickNZ Over a year ago

tks your function is perfect as I can then add to the a array and it will still work where as manually constructing it won't be as dynamic

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