Lodash finding a partial uniqueness within array values

Question

The following code, returns an array of unique value from the data array. However, what I am trying to achieve is return true if there is a uniqueness found at value1:value2. As you can see from the code below value1:value2:value3 and value1:value2:value4 match this criteria. A lodash technique to produce this functionality would be ideal, however for the sake of understanding a solution I would gladly welcome plain 'ol' javascript.

NOTE jQuery and HTML have been included to illustrate my question. The javascript I am after, would be running on NodeJS.

UPDATE

Expected output from running the code below would true as there is a match between value1:value2:value3 and value1:value2:value4 i.e. value1:value2 exist in both values.

UPDATE

Please see the following fiddle for an example of the output I am after.

UPDATE

Included is an example of the output I am after. This is the desired functionality, however I would like a lodash way of achieving the same result.

$(document).ready(function() {
  var data = [
    'value1:value2:value3',
    'value1:value2:value4',
    'value5:value6:value7',
    'value1:value2:value3'
    ];
  var partialValueMatch = function(data) {
    var lookup = _.uniqBy(data, function(str){
      return str.substring(0, str.lastIndexOf(':'))
    });
    if(lookup.length < data.length) return true;
    return false;
  }
  var $output = $('#output');
  $output.html(partialValueMatch(data));
});

#output {
  background: #fafafa;
  border: 1px solid #d8d8d8;
  padding: 5px 10px;
  font-family: monospace;
  border-radius: 2px;
  color: red;
  }

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0-rc1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.13.1/lodash.min.js"></script>
<div id="output"></div>

Can you explain a bit better, given a data set what would be the ideal output? — Avraam Mavridis
– Avraam Mavridis, Commented May 24, 2016 at 10:21

Jagdish Idhate · Accepted Answer · 2016-05-24 11:28:39Z

2

You can use _.uniqBy

 var data = [
    'value1:value2:value3',
    'value1:value2:value4',
    'value5:value6:value7',
    'value1:value2:value3'
    ];

var output = _.uniqBy(data,function(str){
   return str.substring(0,str.lastIndexOf(':'))
 });
console.log(output);
console.log('Is duplicates found:',output.length<data.length);

This will give you uniq data as below

//["value1:value2:value3", "value5:value6:value7"]
//Is duplicates found: true

edited May 24, 2016 at 11:28

answered May 24, 2016 at 10:28

Jagdish Idhate

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7 Comments

stackunderflow Over a year ago

Awesome and usable for my needs. However, is there any way I could make it return true?

Jagdish Idhate Over a year ago

Where need return true in output, Plz share output sample with us.

stackunderflow Over a year ago

In your example, the length of the data array has changed, so I guess a comparison could be made on the original input array length and the output length, if it's less than the original.. return true.

Jagdish Idhate Over a year ago

Yep, You can get it by comparing input & output data length.

stackunderflow Over a year ago

I have included a fiddle here jsfiddle.net/s4zpoaw1 to better explain my example, using the method you described.

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