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var car = ["Saab","Volvo","BMW","Saab","BMW",];
var cars = [new Set(car)]
document.getElementById("demo").innerHTML = cars;
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let arr = [1,2,3,1,1,1,4,5]
let filtered = arr.filter((item,index) => arr.indexOf(item) === index)
console.log(filtered) // [1,2,3,4,5]
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// how to remove duplicates from array in javascript
// 1. filter()
let num = [1, 2, 3, 3, 4, 4, 5, 5, 6];
let filtered = num.filter((a, b) => num.indexOf(a) === b)
console.log(filtered);
// Result: [ 1, 2, 3, 4, 5, 6 ]
// 2. Set()
const removeDuplicates = (arr) => [new Set(arr)];
console.log(removeDuplicates([1, 2, 3, 3, 4, 4, 5, 5, 6]));
// Result: [ 1, 2, 3, 4, 5, 6 ]
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const array = [5,4,7,8,9,2,7,5];
array.filter((item,idx,arr) => arr.indexOf(item) === idx);
// or
const nonUnique = [new Set(array)];
// Output: [5, 4, 7, 8, 9, 2]
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// for TypeScript and JavaScript
const initialArray = ['a', 'a', 'b',]
finalArray = Array.from(new Set(initialArray)); // a, b
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uniqueArray = a.filter(function(item, pos) {
return a.indexOf(item) == pos;
})
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var myArr = [1, 2, 2, 2, 3];
var mySet = new Set(myArr);
myArr = [mySet];
console.log(myArr);
// 1, 2, 3
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uniqueArray = a.filter(function(item, pos) {
return a.indexOf(item) == pos;
})
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function onlyUnique(value, index, self) {
return self.indexOf(value) === index;
}
// usage example:
var a = ['a', 1, 'a', 2, '1'];
var unique = a.filter(onlyUnique);
console.log(unique); // ['a', 1, 2, '1']
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function removeDuplicates(arr) {
const map = new Map();
const result = [];
for (const item of arr) {
if (!map.has(item)) {
map.set(item, true);
result.push(item);
}
}
return result;
}
const array = [1, 2, 3, 3, 4, 4, 5];
const uniqueArray = removeDuplicates(array);
console.log(uniqueArray); // Output: [1, 2, 3, 4, 5]