Check if array duplicates

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// check array duplicates
const hasDuplicates = array => (new Set(array)).size !== array.length;

// array data
let data = ["a-1", "b-2", "c-1"];

// new element 
let newData = "a-1"

// combine
let newArr = [...data, newData];

// check duplicates
if(hasDuplicates(newArr)){
  console.log('Yes')
}else{
  console.log('Nop')
}

// without expresion
console.log([...new Set(newArr)])

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