Javascript ECMAScript 5: arrays merging and deduction -

Javascript ECMAScript 5: arrays merging and deduction -

i have got 3 arrays:

presententities = ['1', '2', '3']; addedentities = ['3', '4']; removedentities = ['2'];

i need:

merge presententities addedentities , take business relationship possible duplicates (means need set) deduct removedentities result

expected result:

['1', '3', '4']

question: true way in javascript?

here ecmascript 5 compatible way:

class="snippet-code-js lang-js prettyprint-override">var presententities = ['1', '2', '3']; var addedentities = ['3', '4']; var removedentities = ['2']; var uniqueentities = addedentities.filter(function(value) { if (presententities.indexof(value) === -1) homecoming value; }); mergedentities = presententities.concat(uniqueentities); var finalentities = mergedentities.filter(function(value) { if (removedentities.indexof(value) === -1) homecoming value; }); document.body.innerhtml = json.stringify(finalentities);

javascript