September 2018
Intermediate to advanced
328 pages
9h 10m
English
Content preview from Learn WebAssembly
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Definitions and S-expressions
To understand Wat, let's start with the first sentence of the description taken directly from the WebAssembly Core Specification:
"The textual format for WebAssembly modules is a rendering of their abstract syntax into S-expressions."
So what are symbolic expressions (S-expressions)? S-expressions are notations for nested list (tree-structured) data. Essentially, they provide a simple and elegant way to represent list-based data in textual form. To understand how textual representations of nested lists map to a tree structure, let's extrapolate the tree structure from an HTML page. The following example contains a simple HTML page and the corresponding tree structure diagram.
A simple HTML page:
<html><head> ...
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