Writing An Interpreter In Go by Thorsten Ball

Author:Thorsten Ball [Ball, Thorsten]
Language: eng
Format: azw3, pdf
Published: 2016-12-10T16:00:00+00:00

Evaluation

3.1 - Giving Meaning to Symbols

We are finally here. Evaluation. The E in REPL and the last thing an interpreter has to do when processing source code. This is where code becomes meaningful. Without evaluation an expression like 1 + 2 is just a series of characters, tokens, or a tree structure that represents this expression. It doesn't mean anything. Evaluated, of course, 1 + 2 becomes 3. 5 > 1 becomes true, 5 < 1 becomes false and puts("Hello World!") becomes the friendly message we all know.

The evaluation process of an interpreter defines how the programming language being interpreted works.

let num = 5; if (num) { return a; } else { return b; }

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