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up vote 0 down vote favorite

I am trying to filter objects from two array of objects on the basis of name along with few conditions using lodash. Here are the arrays

var param1 = [{'name': 'sa', 'value':'sample'},
              {'name': 'sam', 'value':''}];

var param2 = [{'name': 's1', 'value':'ex1'},
           {'name': 's2', 'value':'ex2'},
           {'name': 's3', 'value':'ex3'},
           {'name': 'sa', 'value':'ex4'}];

I wanted to check the objects of param1[by name] existence in param2, if so return the param1 object along with the rest of the objects left within param2. So the final result has to be some thing like this: 

result= [{'name': 's1', 'value':'ex1'},
         {'name': 's2', 'value':'ex2'},
         {'name': 's3', 'value':'ex3'},
         {'name': 'sa', 'value':'sample'}];

I have tried with couple of lodash functions such as _.filter, _.map, _.difference but am clueless on how to chain this functionality and get the appropriate result.

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up vote 0 down vote

Dont think you will need lodash for it, You can use array forEach to execute it

var param1 = [{
  'name': 'sa',
  'value': 'sample'
}, {
  'name': 'sam',
  'value': ''
}];

var param2 = [{
  'name': 's1',
  'value': 'ex1'
}, {
  'name': 's2',
  'value': 'ex2'
}, {
  'name': 's3',
  'value': 'ex3'
}, {
  'name': 'sa',
  'value': 'ex4'
}];

param1.forEach(function(item) {
     param2.forEach(function(item2){
      if(item.name ==item2.name){
       item2.value = item.value
     }
   })

})

console.log(param2)

DEMO

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up vote 0 down vote

Lodash with _.forEach and _.find.

var param1 = [{'name': 'sa', 'value':'sample'}, {'name': 'sam', 'value':''}];
var param2 = [{'name': 's1', 'value':'ex1'}, {'name': 's2', 'value':'ex2'}, {'name': 's3', 'value':'ex3'}, {'name': 'sa', 'value':'ex4'}];

_.forEach(param1, a => {
    var o = _.find(param2, b => a.name === b.name);
    if (o) {
        o.value = a.value;
    }
});

console.log(param2);
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.15.0/lodash.min.js"></script>

Plain ES6 Javascript

var param1 = [{'name': 'sa', 'value':'sample'}, {'name': 'sam', 'value':''}];
var param2 = [{'name': 's1', 'value':'ex1'}, {'name': 's2', 'value':'ex2'}, {'name': 's3', 'value':'ex3'}, {'name': 'sa', 'value':'ex4'}];

param1.forEach(a => {
    var o = param2.find(b => a.name === b.name);
    if (o) {
        o.value = a.value;
    }
});

console.log(param2);

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