CODEWITHSUNDEEP
javascriptlodash
Sampath
Sampath

Reputation: 65900

Remove a list of array items

Can you tell me how to remove a list of array items using lodash? I have tried as shown below.But it is not working.

Video about the issue.

  _.remove(previousNumberArray, (a) => {

         _.some(this.removedQuestionCodes, (val, k) => {
            return a.questionCode == val.questionCode;
        });

   });

Upvotes: 0

Views: 70

Answers (1)

taile
taile

Reputation: 2776

The problem is the bracket {} for arrow function inside {} should have return

Let's try

  _.remove(previousNumberArray, (a) => _.some(this.removedQuestionCodes, (val, k) => {
       return a.questionCode == val;
  }));

Or

  _.remove(previousNumberArray, (a) => {

         return _.some(this.removedQuestionCodes, (val, k) => {
            return a.questionCode == val;
        });

   });

Let's see my example:

var fruits1 = ['Apple', 'Banana', 'Orange', 'Celery'];

_.remove(fruits1, fruit => {//BRACKET
  //MUST HAVE RETURN KEYWORD
  return _.indexOf(['Apple', 'Banana', 'Orange'], fruit) !== -1
});

var fruits2 = ['Apple', 'Banana', 'Orange', 'Celery'];
_.remove(fruits2, fruit => {//BRACKET
  //DONT HAVE RETURN KEYWORD
  _.indexOf(['Apple', 'Banana', 'Orange'], fruit) !== -1
});

console.log('fruits1',fruits1)


console.log('fruits2', fruits2)
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.6.1/lodash.js"></script>

Upvotes: 1

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