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diff --git a/doc/fromDyalog.md b/doc/fromDyalog.md index a3c7c7a2..68973091 100644 --- a/doc/fromDyalog.md +++ b/doc/fromDyalog.md @@ -32,6 +32,27 @@ Dyalog uses value types (array, function, and so on) to determine syntax while B | Dyadic operator | 2-modifier | | Niladic function | *go away* | +## Syntax + +BQN comments are written with `#`, not `⍝`. BQN strings use double quotes `""` while single quotes `''` enclose a character. + +BQN's functions use `{}`, like Dyalog's dfns. The names for inputs and self-reference are different: + +| Dyalog | BQN | +|--------|-----| +| `⍺` | `𝕨` | +| `⍵` | `𝕩` | +| `∇` | `𝕊` | +| `⍺⍺` | `𝔽` | +| `⍵⍵` | `𝔾` | +| `∇∇` | `𝕣` | + +BQN doesn't have guards: it uses modifiers or [control structures](control.md) instead. However, BQN function and modifier blocks have headers that allow pattern matching. See the [block](block.md) documentation. + +The assignment arrow `←` defines a new variable in a block, while `↩` modifies an existing one. + +BQN uses the ligature character `‿` for stranding, instead of plain juxtaposition. It also has a [list notation](syntax.md#list-notation) using `⟨⟩`. + ## For reading Here are some closest equivalents in Dyalog APL for the BQN functions that don't use the same glyphs as APL. Correspondence can be approximate, and `⌽` is just used as a decorator to mean "reverse some things". |