Finding second smallest word in a string - JavaScript

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We are required to write a JavaScript function that takes in a string sentence as first and the only argument. The function should return the length of the second smallest word from the string.

For example: If the string is −

const str = 'This is a sample string';

Then the output should be 2.

Example

Following is the code −

const str = 'This is a sample string';
const secondSmallest = str => {
   const strArr = str.split(' ');
   if(strArr.length < 2){
      return false;
   }
   for(let i = 0; i < strArr.length; i++){
      strArr[i] = strArr[i].length;
   };
   strArr.sort((a, b) => a - b);
   return strArr[1];
};
console.log(secondSmallest(str));