- What are Formulas?
- Things you can do when building your formulas
- Things to be aware of when building your formulas
- Types of Formulas
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What are Formulas?
Formula block allows you to make complex operations with values inside Landbot, like you do in other platforms like Google Spreadsheets or Excel, and store the result in an outcome variable.
How to create a Formula
1. Select the variable where you want to store the outcome of the formula
2. Set the formula
3. Save and use
Elements of the Formulas block
In the Output field you can define or create the variable where the result of the formula is going to be stored
Here is the editor, where you can create and edit formulas
3. Formulas Browser/Docs
In this section, you will see all the available methods you can use in the Formulas block.
Things you can do when building your formulas
1. Formulas can use fixed values
2. Formulas can use Landbot variables
3. Formulas can use formulas inside formulas
4. Formulas can use same output variable
5. Formulas can be chained one after another
6. Formulas can be great with the Conditional block
Things to be aware of when building your formulas
1. Blue ticks!
To be a valid formula, make sure both ticks are blue
2. Output variable type
Make sure the type of the variable is the right format to the type of formula you are using.
For example, if you are creating a math operation, you want the variable of the output to be a number, not a string type.
3. Outputs, there are two possible outcomes when using the Formula block:
Green Output => Success
Red Output => Fail
4. True and False, are strings that start with Capital letter!
In case you are using a type of formula that the outcome can be a boolean value, remember that True or False will be strings that the first letter will be Uppercase.
5. System variables need " "
If you are planning to use Landbot System variables like @today, add the " " between those variables:
6. Not created variables need " "
If the variable is not created yet, it needs " " also to be a valid formula
7. Test before you go into production!
Test always to make sure the Formula works as expected
Types of Formulas
Comparison formulas available:
Examples of use case of Comparison formulas:
Check if input from the user is the same as a number
Check if age is above 18
Check if the variable email is set or not
Logical formulas available:
Examples of use case of Logical formulas:
Check if email contains "gmail.com" AND the age is over 18
Check that the user did NOT select a color "red"
Check if the "city" selected is Barcelona OR Madrid
Math formulas available:
Examples of use case of Math formulas:
Apply 20% discount
Get % of correct answers
Add +1 every time user passes through this step
String formulas available:
Examples of use case of String formulas:
Ensure the email is in lower case for proper validation
Get list out of options selected in Multiplechoice
Split(@options, ", ")
Note, if you want to limit the number of options, this will be handy if you add use also the Length formula and with a Conditional block, you redirect the flow according to the maximum number of options you require. Like in th example below:
Where the formula is:
Length(Split(@options, ", "))
Check if text is too long
Replace(Replace(Replace(Replace(Replace(Replace(Replace(Replace(Replace(Replace(Replace(Replace(Replace(Replace(@toreplace, "a", "i"),"e","i"),"o","i"),"u","i"),"y","i"),"é","i"),"è","i"),"á","i"),"à","i"),"ò","i"),"ó","i"),"ù","i"),"ó","i"),"ü","i")
Array formulas available:
Examples of use case of Array formulas:
Get length of an arrays
Create an array out different strings
Add last user input to an array
Object formulas available:
Examples of use case of Object formulas:
Get value from the key "Name"
Get value from first item of the array that is in the key "colors"
Transform string to a JSON
Regex formulas available:
Examples of use case of Regex formulas:
Check if the input is of 10 digits number
Check if the input is a valid UK postal code
Check if the input contains a word that is "stop" or something that starts with "stop"