How to use the union function from underscore

camel.js

GitHub: cliss/camel

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app.post('/render-draft', [requireAuth, bodyParser.urlencoded({extended: true})], function (request, response) {
	var pieces = getLinesFromData(request.body.markdown);
	pieces.metadata = _.union(pieces.metadata, ["@@ BodyClass=post"]);
	//var titleIndex = pieces.metadata.findIndex(/^@@ Title=/);
	//pieces.metadata[titleIndex] = "@@ Title=DRAFT – " + pieces.metadata[titleIndex].substr(9) + " – DRAFT";
	var result = generateHtmlAndMetadataForLines(pieces);
	response.send(result.html());

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profile.js

GitHub: yonas/meteor-freebsd

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    reportOn(0, entry);
  });
};

var allLeafs = function () {
  return _.union(_.map(_.filter(entries, isLeaf), entryName));
};

var leafTotal = function (leafName) {
  var total = 0;

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+ 5 other calls in file

customer.js

GitHub: gautam-16/prod

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.then(function(data){
    //let actionplanQuestionIds = _.uniq(_.pluck(actionPlans,'questionId'))
    let customerActionQuestionIds = _.uniq(_.pluck(actionPlans,'questionId'));
    let customerQuestionIds = _.uniq(_.pluck(questionList,'questionId'));

    let questionIds = _.union(customerActionQuestionIds,customerQuestionIds);
    let customerPositiveActionPlan = _.reject(actionPlans,(planData)=>{
        return !planData.isPositive
    })
    let categoryPositiveActionPlan = _.reject(data,(planData)=>{

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UpdatesManager.js

GitHub: overleaf/overleaf

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previousUpdateWasBigDelete = isBigDelete

if (shouldConcat) {
  // check if the user in this update is already present in the earliest update,
  // if not, add them to the users list of the earliest update
  earliestUpdate.meta.user_ids = _.union(earliestUpdate.meta.user_ids, [
    update.meta.user_id,
  ])

  docId = update.doc_id.toString()

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+ 5 other calls in file