Apex Practice Problems - ApexSandbox.io

One of my favorite algorithms.

public static Integer search(List<Opportunity> opportunities, Integer target){
    Integer first = 0;
    Integer last = opportunities.size()-1;
    while (first <= last) {
        Integer middle = first + (last - first) / 2;    
        if (target == opportunities[middle].Amount) 
            return middle;
        else if (target < opportunities[middle].Amount) 
            last = middle - 1;
        else
            first = middle + 1;
    }
    return -1;
}

#17 - Age Group

public String ageGroup(Integer n) {    
    return n < 2 ? 'Infant' : n < 15 ? 'Child' : n < 22 ? 'Youth' : 'Adult'; 
}

I've just completed Apex 101 and Database 101 challenges :) . This positions me in the top 8 percent of ApexSandbox users.

The "Change Time Format" problem really got me. I tried searching for appropriate methods in the Time and DateTime classes but there I couldn't see a out of the box method or methods that would solve the problem. I see that the hints direct me in different path. Nice "gotcha". :) 

Hi, 

I've logged in after the a few days back to ApexSandbox where I completed of about 15 problems but i don't see the code that I composed why is this so? Is uploading to GitHub the only way to store the problems solutions? 

Thanks in advance, 

Dimitar Nikolov

ApexSandbox Website is good for solving the problems but I didn't find anything like public profile

similar to the Leetcode.  

if not than I think creators should implement that as well. It will boost up the adoption and can make this website as standard for problem solving. 

what's your thoughts?

may be a bit more complex but  

public List<sObject> getListOfsObject(List<Account> accounts, List<Contact> contacts)
{
    List<sObject> objList = new List<sObject>();
    if(accounts == null  && contacts == null){
        return objList;
    }
    for(Account acc : accounts?? new List<sObject>()){
        objList.add(acc);
    }
    for(Contact c : contacts?? new List<sObject>()){
        objList.add(c);
    }
    return objList;
}

public List<Account> getAccountsFromJSONString(String inputJSON){
    if(inputJson == null){
        return null;
    }
    return (List<Account>) JSON.deserialize(inputJSON, List<Account>.class);
}

public String getAccountBillingCityWithSafeNavigation(List<Account> accounts){
   // Code here
   return accounts[0].BillingCity?.toUpperCase();
}