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Add log2 and log10 functions to math library #553

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Add log2 and log10 functions to math library #553

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5620623
Add log2 and log10 functions for logarithmic calculations
Shawon-Dey188 Jul 11, 2026
19ec6f9
Add log2 and log10 functions to STDLIB documentation
Shawon-Dey188 Jul 11, 2026
0a83337
Fix formatting in BUILTINS.md for borrow guard selftest
Shawon-Dey188 Jul 11, 2026
eaaefb8
Merge pull request #1 from Shawon-Dey188/Shawon-Dey188-patch-1
Shawon-Dey188 Jul 11, 2026
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2 changes: 1 addition & 1 deletion docs/BUILTINS.md
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Expand Up @@ -618,4 +618,4 @@ receiver.

| Name | Signature | Description |
|------|-----------|-------------|
| `__borrow_guard_selftest` | `__borrow_guard_selftest of [args...]` | **Not a user builtin.** A planted fault validating the #548 borrow-scan guard: registered only in ASan builds when `EIGS_BORROW_GUARD_SELFTEST` is set, it deliberately returns a borrowed direct child past `VM_BORROW_SCAN_CAP` so the suite can prove the guard aborts loudly (naming the builtin) instead of letting a missed compensating incref become a silent use-after-free. Absent from release builds and from sanitizer builds without the opt-in env var (fuzzers must never reach a deliberate abort). |
| `__borrow_guard_selftest` | `__borrow_guard_selftest of [args...]` | **Not a user builtin.** A planted fault validating the #548 borrow-scan guard: registered only in ASan builds when `EIGS_BORROW_GUARD_SELFTEST` is set, it deliberately returns a borrowed direct child past `VM_BORROW_SCAN_CAP` so the suite can prove the guard aborts loudly (naming the builtin) instead of letting a missed compensating incref become a silent use-after-free. Absent from release builds and from sanitizer builds without the opt-in env var (fuzzers must never reach a deliberate abort). |
3 changes: 2 additions & 1 deletion docs/STDLIB.md
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Expand Up @@ -58,7 +58,8 @@ signature comment above each function (e.g., `# clamp of [value, lo, hi]`).
| `lcm` | `lcm of [a, b]` | Least common multiple |
| `argmax` | `argmax of list` | Index of the largest element (first on ties, -1 if empty) |
| `argmin` | `argmin of list` | Index of the smallest element (first on ties, -1 if empty) |

| `log2` | `log2 of x` | base-2 logarithm |
| `log10` | `log10 of x` | base-10 logarithm |
### lib/list.eigs — Functional List Operations

| Function | Signature | Description |
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9 changes: 9 additions & 0 deletions lib/math.eigs
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Expand Up @@ -135,3 +135,12 @@ define argmin(items) as:
best_val is items[i]
best_idx is i
return best_idx

# ---- log2: base-2 logarithm ----
define log2(x) as:
return (log of x) / 0.6931471805599453

# ---- log10: base-10 logarithm ----
define log10(x) as:
return (log of x) / 2.302585092994046

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