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functions.txt
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================================================================================
Simple functions
================================================================================
let fahrenheit_to_celsius temp -> (temp - 32) / 1.8
from cities
derive temp_c = (fahrenheit_to_celsius temp_f)
--------------------------------------------------------------------------------
(program
(function_definition
(keyword_let)
(identifier)
(parameter
(identifier))
(binary_expression
(binary_expression
(field
(identifier))
(literal
(integer)))
(literal
(decimal_number
(integer)))))
(pipeline
(from
(keyword_from)
(identifier))
(transforms
(derives
(keyword_derive)
(term
(assignment
(field
(identifier))
(function_call
(identifier)
(parameter
(identifier)))))))))
================================================================================
Functions with default parameters
================================================================================
let interp lower:0 higher x -> (x - lower) / (higher - lower)
from students
derive {
sat_proportion_1 = (interp 1600 sat_score),
sat_proportion_2 = (interp lower:0 1600 sat_score),
}
--------------------------------------------------------------------------------
(program
(function_definition
(keyword_let)
(identifier)
(parameter
(identifier)
(literal
(integer)))
(parameter
(identifier))
(parameter
(identifier))
(binary_expression
(binary_expression
(field
(identifier))
(field
(identifier)))
(binary_expression
(field
(identifier))
(field
(identifier)))))
(pipeline
(from
(keyword_from)
(identifier))
(transforms
(derives
(keyword_derive)
(term
(assignment
(field
(identifier))
(function_call
(identifier)
(parameter
(literal
(integer)))
(parameter
(identifier)))))
(term
(assignment
(field
(identifier))
(function_call
(identifier)
(parameter
(identifier)
(literal
(integer)))
(parameter
(literal
(integer)))
(parameter
(identifier)))))))))