javascript check if array contains duplicates code example
Example 1: check if array has same values javascript
const allEqual = arr => arr.every(v => v === arr[0]);
allEqual([1,1,1,1]);
Example 2: javascript check if array has duplicates
function hasDuplicates(array) {
return (new Set(array)).size !== array.length;
}
Example 3: js check if array of objects contains duplicates
const arrayOfObjCopy = [...arrayOfObj];
Object.keys(arrayOfObjCopy).forEach((key) => {
arrayOfObjCopy[key] = JSON.stringify(arrayOfObjCopy[key]);
});
const arrayOfObjhasDuplicates = uniq(arrayOfObjCopy).length != arrayOfObjCopy.length;