JavaScript Javascript: How to remove only one value from duplicate array values javascript remove only one class,javascript remove only leading spaces,

You could check if given element has dupe elements or not, if so - remove just one duplicate entry of specified element from the original array.

var arr = ['2530491','2530491','2530491','2530492'],
    hash = [...new Set(arr)];
    hash.forEach((v,i) => arr.indexOf(v) != arr.lastIndexOf(v) ? arr.splice(arr.indexOf(v), 1) : null);
    
    console.log(arr);
Answer:1

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