JavaScript Replace matching members of array compared to other array

Question

I got this task and I can't get how to replace the matches with the string "BUSTED", can you help me please. I'm new to JS. Most probably there is a way more elegant way to do this. Any help appreciated.

You're given two arrays: one that holds every member of fCommunity and another one that holds every possible suspect. Replace every fCommunity member from the Suspect list with the word "BUSTED"

var fCommunityMembers = ['A','B','C'];
var SuspectList = ['F','X','B','Z','Y','C','ZS','D','K','M','N'];

I managed to retrieve the matching members but how do I replace them in the suspect list?:

Array.prototype.diff = function(SuspectList) {
    var ret = [];
    this.sort();
    SuspectList.sort();
    for(var i = 0; i < this.length; i += 1) {
        if(SuspectList.indexOf( this[i] ) > -1){
            ret.push( this[i] );
        }
    }
    return ret;
};

var ListOfMatches = Array.from(fCommunityMembers.diff(SuspectList));

console.log( ListOfMatches );

Ori Drori · Accepted Answer · 2016-11-24 14:53:45Z

1

Use Array.prototype.map() to iterate fCommunityMembers. If an member is found in the SuspectList return BUSTED, if not return the member:

var fCommunityMembers = ['A','B','C'];
var SuspectList = ['F','X','B','Z','Y','C','ZS','D','K','M','N'];

var result = fCommunityMembers.map(function(member) {
  return SuspectList.indexOf(member) !== -1 ? 'BUSTED' : member;
});

console.log(result);

answered Nov 24, 2016 at 14:53

Ori Drori

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Comments

beta-developper · Accepted Answer · 2016-11-24 15:00:16Z

What you need is a function that can do the intersection between two arrays

filter can help in your case

var fCommunityMembers = [
    'A',
    'B',
    'C',
    'D',
    'F'
];
var SuspectList = [
    'F',
    'X',
    'B',
    'Z',
    'Y',
    'C',
    'ZS',
    'D',
    'L'
];
var suspects= fCommunityMembers.filter(function(el){
    return SuspectList.indexOf(el)>-1;
});

Edit #1 To replace the values by busted, do the following:

var suspectsFnc = function (fc, sus) {
    var busted = fCommunityMembers.filter(function (el) {
        return SuspectList.indexOf(el) > -1;
    });

    for (var i = 0; i < fc.length; i++) {
        if (busted.indexOf(fc[i]) > -1) {
            fc[i] = "Busted";
        }
    }
    return fc;

}

var suspects = suspectsFnc(fCommunityMembers, SuspectList);

kevin ternet · Accepted Answer · 2016-11-24 15:41:19Z

0

Judt use filter like this :

var ListOfMatches = SuspectList.filter(x => fCommunityMembers.indexOf(x) !== -1);

and a forEach loop to insert BUSTED instead of previous matched elements

fCommunityMembers.forEach((x,i,arr) => {
  if (SuspectList.indexOf(x) !== -1)
    arr[i] = "BUSTED";
});

edited Nov 24, 2016 at 15:41

answered Nov 24, 2016 at 14:44

kevin ternet

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2 Comments

KathyBlue Over a year ago

Yes way more elegant to pick the matching members, thanks. How do I replace these common members with a string "BUSTED" in the CommunityMembers array?

kevin ternet Over a year ago

@KathyBlue : answered above just now

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