In Apex, a "get" method retrieves the value of a field within an object, while a "set" method allows you to update or assign a new value to that same field.
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More simplification : a variable stores data, while a function performs an action.
For example: a variable can store the ID of a record, a number value, or the result of joining two text strings.
For example: a function can transform data from records, perform calculations.
In Salesforce, ISNULL and ISBLANK are two functions used to check if a field is empty or null. While they might seem similar, they have distinct differences in how they operate, particularly when dealing with text fields.
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