freeCodeCamp/curriculum/challenges/english/08-coding-interview-prep/data-structures/use-.has-and-.size-on-an-es6-set.english.md

id, title, challengeType

id	title	challengeType
587d8255367417b2b2512c72	Use .has and .size on an ES6 Set	1

Description

Let's look at the .has and .size methods available on the ES6 Set object. First, create an ES6 Set var set = new Set([1,2,3]); The .has method will check if the value is contained within the set. var hasTwo = set.has(2); The .size method will return an integer representing the size of the Set var howBig = set.size;

Instructions

In this exercise we will pass an array and a value to the checkSet() function. Your function should create an ES6 set from the array argument. Find if the set contains the value argument. Find the size of the set. And return those two values in an array.

Tests

tests:
  - text: <code>checkSet([4, 5, 6], 3)</code> should return [ false, 3 ]
    testString: 'assert((function(){var test = checkSet([4,5,6], 3); return DeepEqual(test, [ false, 3 ]);})(), "<code>checkSet([4, 5, 6], 3)</code> should return [ false, 3 ]");'

Challenge Seed

function checkSet(arrToBeSet, checkValue){

   // change code below this line

   // change code above this line

}

checkSet([ 1, 2, 3], 2); // Should return [ true, 3 ]

Solution

function checkSet(arrToBeSet, checkValue){
var set = new Set(arrToBeSet);
var result = [
set.has(checkValue),
set.size
];
return result;
}