Ransom Note.js

/*Given an arbitrary ransom note string and another string containing letters from all the magazines, write a function that will return true if the ransom note can be constructed from the magazines ; otherwise, it will return false.

Each letter in the magazine string can only be used once in your ransom note.

Note:
You may assume that both strings contain only lowercase letters.

canConstruct("a", "b") -> false
canConstruct("aa", "ab") -> false
canConstruct("aa", "aab") -> true*/

/**
 * @param {string} ransomNote
 * @param {string} magazine
 * @return {boolean}
 */
var canConstruct = function(ransomNote, magazine) {
    if(ransomNote.length > magazine.length)
        return false
    superset = magazine.split('')
    for(i=0; i<ransomNote.length; i++){
        j = superset.indexOf(ransomNote[i])
        if(j == -1)
            return false
        else
            superset.splice(j,1)
    }
    return true
};