JavaScript 🐲 challenges_6 ⚔️

#javascript #challenge #beginners #webdev

Scramblies

Complete the function scramble(str1, str2) that returns true.
If a portion of str1 characters can be rearranged to match str2,
otherwise returns false.

Note:

Only lower case letters will be used (a-z).
No punctuation or digits will be included.
Performance needs to be considered.

Example:

scramble('rkqodlw', 'world') ==> True
scramble('cedewaraaossoqqyt', 'codewars') ==> True
scramble('katas', 'steak') ==> False

Task URL

My solution:

function scramble(str1, str2) {

    const stringOne = str1.split('');
    const stringTwo = str2.split('');
    const charCounts = {};

    for (let i = 0; i < stringOne.length; i++) {

        const char = stringOne[i];

        if (charCounts[char]) { // character already seen

            charCounts[char]++;

        } else {  // first time seeing character

            charCounts[char] = 1;
        }
    };

    for (let i = 0; i < stringTwo.length; i++) {

        const char = stringTwo[i]

        if (!charCounts[char]) {

            return false;
        }
        charCounts[char]--;
    };

    return true;

};