Is there a way to determine if an element appears more than once in an array?
var arr = [elm1, elm2, elm3, elm3, elm4, elm5, elm5, elm5, elm6, elm7];
if (elm appears multiple times in the array) {
// code to be executed
} else {
// do something else
}
Any ideas on how to achieve this?
If you're looking for a way to count occurrences in an array, the countInArray function could be a helpful option.
function countInArray(array, what) {
return array.filter(item => item == what).length;
}
Alternatively, you may find this approach more straightforward and easier to customize:
var list = [2, 1, 4, 2, 1, 1, 4, 5];
function countInArray(array, what) {
var count = 0;
for (var i = 0; i < array.length; i++) {
if (array[i] === what) {
count++;
}
}
return count;
}
countInArray(list, 2); // returns 2
countInArray(list, 1); // returns 3
function checkForDuplicates(){
var arr =['1','2','3','3','4'];
for (i=0; i<arr.length;i++){
for (x=0;x<arr.length;x++){
if(arr[i]==arr[x] && i != x){
console.log('Duplicate element in array: '+arr[i]);
}else console.log('No duplicates found');
}
}
}
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