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Chapter 1: Function Abstraction

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Concepts

infix notation

operand operator operand contrasts with Scheme's prefix notation - operator operant operant

after operator combinations

Function applications are—after operator combinations—the second kind of combination of expressions into larger expressions. function-expression(argument-expressions)

left-associative

means that operators of the same precedence are grouped from left to right.

read–evaluate–print loop (REPL)

an interactive environment that repeatedly performs four steps:

1. Read the expression you enter.
2. Evaluate it.
3. Print the resulting value.
4. Loop back and wait for the next expression.

Evaluation Process Thinking Models

substitution model for function application

• normal-order evaluation: fully expand and then reduce

• applicative-order evaluation: evaluate the arguments and then apply

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