Syntax error Find unique and biggest string values from an array in JavaScript

Find unique and biggest string values from an array in JavaScript

Let’s say, we have an array of objects like this −

Example

const arr = [
   {text:'use'},
   {text: 'secur'},
   {text: 'form'},
   {text: 'user'},
   {text: 'users'},
   {text: 'form'},
   {text: 'secur'},
   {text: 'sec'},
   {text: 'users'},
   {text: 'secu'},
   {text: 'secur'},
   {text: 'for'},
   {text: 'form'}
]

Our job is to write a function that takes in this array and a number n and the function should return an array of n objects which have the longest string value for the text key and all the objects should have a unique value for the text key. If there doesn’t exist n unique objects, then we should return all unique objects.

Therefore, let’s write the code for this function −

Example

const arr = [
   {text: 'use'},
   {text: 'secur'},
   {text: 'form'},
   {text: 'user'},
   {text: 'users'},
   {text: 'form'},
   {text: 'secur'},
   {text: 'sec'},
   {text: 'users'},
   {text: 'secu'},
   {text: 'secur'},
   {text: 'for'},
   {text: 'form'}
];
const sorter = (a, b) => {
   return b.text.length - a.text.length;
}
const longestUnique = (arr, num) => {
   const copy = arr.slice();
   copy.sort(sorter);
   const map = new Map();
   const uniqueCopy = copy.filter(el => {
      const exists = map.get(el.text);
      if(exists){
         return false;
      };
      map.set(el.text, 1);
      return true;
   });
   return uniqueCopy.splice(0, num);
}
console.log(longestUnique(arr, 4));
console.log(longestUnique(arr, 12));

Output

The output in the console will be −

[
   { text: 'secur' },
   { text: 'users' },
   { text: 'form' },
   { text: 'user' }
]
[
   { text: 'secur' },
   { text: 'users' },
   { text: 'form' },
   { text: 'user' },
   { text: 'secu' },
   { text: 'use' },
   { text: 'sec' },
   { text: 'for' }
]
Updated on: 2020-08-28T13:56:28+05:30

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