js delete duplicates from array
const names = ['John', 'Paul', 'George', 'Ringo', 'John'];
let unique = [...new Set(names)];
console.log(unique); // 'John', 'Paul', 'George', 'Ringo'js delete duplicates from array
const names = ['John', 'Paul', 'George', 'Ringo', 'John'];
let unique = [...new Set(names)];
console.log(unique); // 'John', 'Paul', 'George', 'Ringo'javascript remove duplicates
var arr = ["apple", "mango", "apple", "orange", "mango", "mango"];
function removeDuplicates(arr) {
return arr.filter((item,
index) => arr.indexOf(item) === index);
}
console.log(removeDuplicates(arr)); // ["apple", "mango", "orange"]javascript compare arrays remove duplicates
var arr1 = [1, 2, 3, 4, 5];
var arr2 = [1, 3, 5, 7, 9];
arr2 = arr2.reduce(function (prev, value) {
var isDuplicate = false;
for (var i = 0; i < arr1.length; i++) {
if (value == arr1[i]) {
isDuplicate = true;
break;
}
}
if (!isDuplicate) {
prev.push(value);
}
return prev;
}, []);
alert(JSON.stringify(arr2));
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