js map avoid same values code example

Example 1: how to remove duplicates in array in javascript

const numbers = [1 , 21, 21, 34 ,12 ,34 ,12];
const removeRepeatNumbers = array => [... new Set(array)]
removeRepeatNumbers(numbers) // [ 1, 21, 34, 12 ]

Example 2: javascript remove duplicate strings from array

//ES6
let uniqueArray = [...new Set(arrayWithDuplicates)];

//Alternative
function removeArrayDuplicates(arrayWithDuplicates) {
    let seen = {};
    let uniqueArray = [];
    let len = arrayWithDuplicates.length;
    let j = 0;
    for(let i = 0; i < len; i++) {
         let item = arrayWithDuplicates[i];
         if(seen[item] !== 1) {
               seen[item] = 1;
               uniqueArray[j++] = item;
         }
    }
    return uniqueArray;
}

Example 3: remove duplicates from array javascript

arr.filter((v,i,a)=>a.findIndex(t=>(t.place === v.place && t.name===v.name))===i)

Example 4: removing duplicates from array javascript

var names = ["Mike","Matt","Nancy","Adam","Jenny","Nancy","Carl"];
var uniqueNames = [];
$.each(names, function(i, el){
    if($.inArray(el, uniqueNames) === -1) uniqueNames.push(el);
});