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Lesson: 02 Sets

A Set is a collection type which contains multiple number of unordered unique records. A Set cannot have duplicate records. Like Lists, Sets can be nested.

Set<string> Colors = new Set<string>();

A set with it elements can be declared as the following.

Apex Code

Set<string> Colors = new Set<string>
{'Red', 'Blue', 'Green'};
System.debug('Colors: '+Colors);

Apex Code

Set<string> Colors = new Set<string>
{'Red', 'Blue', 'Green'};
System.debug('The size of the set is : '+Colors.size());

The keyword `add()` can be used to add more element in the set:

Execution Log

Set<string> Colors = new Set<string>
{'Red', 'Blue', 'Green'};
    Colors.add('Orange');
System.debug('The size of the set is : '+Colors.size());

Apex Code

Set<string> Colors = new Set<string>
{'Red', 'Blue', 'Green','Orange'};
    Colors.clear();
System.debug('Colors: '+Colors);

Apex Code

Set<string> Colors = new Set<string>
{'Red', 'Blue', 'Green','Orange'};
    Colors.remove('Green');
System.debug('Colors: '+Colors);

Apex Code

Set<string> Colors = new Set<string>
{'Red', 'Blue', 'Green','Orange'};
    for (String i : Colors) {
      System.debug(i);
    }

Apex Code

Set<string> ColorsLowerCase = new Set<string>
{'Red', 'Blue', 'Black','Pink'};
Set<string> ColorsUpperCase = new Set<String>();
    for (String i : ColorsLowerCase) {
        
        ColorsUpperCase.add(i.toUpperCase());
      
    }
System.debug(ColorsUpperCase);

Exercises

#	Exercise
1	Initializing a New Set
2	Convert a List to a Set

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A. Apex Fundamentals (23 lessons)

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Lesson: 02 Sets

A set with it elements can be declared as the following.

Apex Code

Execution Log

Video

You can use the `size()` method to find the number of elements of the set:

Apex Code

The keyword `add()` can be used to add more element in the set:

Execution Log

Video

To remove all the elements in the set, use the `clear()` method:

Apex Code

Execution Log

Video

To remove an element, use the `remove()` method and refer to the index number:

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Video

Use `for-each` loop to list all the elements of the set:

Apex Code

Execution Log

Video

Converting all the elements of the Set to uppercase using the keyword `toUpperCase()`:

Apex Code

Execution Log

Video

Exercises

Apex Beginner

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Lesson: 02 Sets

A set with it elements can be declared as the following.

Apex Code

Apex Beginner