Calculation Variables - Let() function

Created by Matt Petrowsky, last modified by Jeremy Bante on Dec 02, 2010

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Let functions with only one variable declaration can be defined on one line

Let ( ~someVar = Table::fieldName ; If ( ~someVar = "Active"; True; False ) )

Let functions with multiple variables include the opening parenthesis and bracket on the same line
Let ( [

good
Let ( [

bad

Closing Let variable declarations end on their own line. This indicates the start of the result.
];

good
endOfFunction ) ];

bad

Calculation scoped variables use camelCase and are identified by a preceding variable indicator of "var."
^{This makes it easy to distinguish calculation variables from custom function arguments, $variables, and Table::fieldNames}
~someVariable

good
someVariable

bad

Use present tense verbs or adjectives to indicate Boolean variable status on both calculation and locally scoped variables.
```
$hasReturns
~isTrailing
$containsSpaces
not ~containsEmailAddress
```

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