remove duplicate objects from list typescript

how to remove duplicate array object in javascript

var arrayWithDuplicates = [
    {"type":"LICENSE", "licenseNum": "12345", state:"NV"},
    {"type":"LICENSE", "licenseNum": "A7846", state:"CA"},
    {"type":"LICENSE", "licenseNum": "12345", state:"OR"},
    {"type":"LICENSE", "licenseNum": "10849", state:"CA"},
    {"type":"LICENSE", "licenseNum": "B7037", state:"WA"},
    {"type":"LICENSE", "licenseNum": "12345", state:"NM"}
];

function removeDuplicates(originalArray, prop) {
     var newArray = [];
     var lookupObject  = {};

     for(var i in originalArray) {
        lookupObject[originalArray[i][prop]] = originalArray[i];
     }

     for(i in lookupObject) {
         newArray.push(lookupObject[i]);
     }
      return newArray;
 }

var uniqueArray = removeDuplicates(arrayWithDuplicates, "licenseNum");
console.log("uniqueArray is: " + JSON.stringify(uniqueArray));

Posted by: Guest on April-22-2020

Source

// BEST ANSWER - LINEAR TIME SOLUTION const seen = new Set(); const arr = [ { id: 1, name: "test1" }, { id: 2, name: "test2" }, { id: 2, name: "test3" }, { id: 3, name: "test4" }, { id: 4, name: "test5" }, { id: 5, name: "test6" }, { id: 5, name: "test7" }, { id: 6, name: "test8" } ]; const filteredArr = arr.filter(el => { const duplicate = seen.has(el.id); seen.add(el.id); return !duplicate; });

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