![]() If they don’t match, that implies that the element is a duplicate.All such elements are returned in a separate array using the filter() method. ![]() In this method, what we do is that we compare the index of all the items of an array with the index of the first time that number occurs. You can accordingly choose the best one for your use case. Some of these methods only count the number of duplicate elements while the others also tell us which element is repeating and some do both. In this article we shall look at the different methods of finding duplicates in an array. Just be careful not to decode something that’s already decoded or else your script will error out, especially if percents are involved.Īnyways, congrats! Now you know how to get a URL parameter, and hopefully have picked up some other tricks along the way.Find duplicates in an array using javaScript test // 'a%20space' var decoded = decodeURIComponent (original ) // 'a space' If your URL has any encoded special characters like spaces (encoded as %20), you can also decode them to get the original value like this: // assume a url parameter of test=a%20space var original = getAllUrlParams ( ). log (value ) // shirt, blue,, m for ( const entry of entries ) įinally, we return our object with the parameters and values. ![]() log (key ) // product, color, newuser, size for ( const value of values ) console. ![]() entries ( ) for ( const key of keys ) console. URLSearchParams also provides some familiar Object iterator methods, allowing you iterate over its keys, values and entries: constĮntries = urlParams. getAll ( 'size' ) ) // Iterating over Parameters getAll ( 'size' ) ) // //Programmatically add a second size parameter. You can use URLSearchParams.getAll() to return all of the values associated with a particular parameter: console. has ( 'paymentmethod' ) ) // false Getting All of a Parameter’s Values You can use URLSearchParams.has() to check whether a certain parameter exists: console. Other Useful Methods Checking for the Presence of a Parameter ![]()
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