(bin) - JavaScript

binary expressions like a + b or a && b

(bin operator left? right?)

Where:

1. operator: binary operator token (e.g., +, &&, ===) *
2. left: left-hand operand *
3. right: right-hand operand *

Matching:

1. arithmetic operators, e.g. a + b
2. logical operators, e.g. a && b
3. comparison operators, e.g. a === b

Behavior

• The operator must match exactly (e.g., == vs ===).

Examples

Find string concatenations that build URLs from user input.

(bin + (str /https?:\/\//) (id userInput))

Selects in lines { 1 } but not in { 2, 3 }:

const url1 = "https://api.example.com/" + userInput
const url2 = "https://api.example.com/" + userId
const url3 = baseUrl + userInput

---

Locate non-strict equality checks against null.

(bin == _ (null))

Selects in lines { 1 } but not in { 2, 3 }:

if (value == null) { }
if (value === null) { }
if (value == undefined) { }

---

Find guard conditions that combine feature flags with auth checks.

(bin && (id featureEnabled) (id isAuthenticated))

Selects in lines { 1 } but not in { 2, 3 }:

if (featureEnabled && isAuthenticated) { }
if (featureEnabled || isAuthenticated) { }
if (isAuthenticated && featureEnabled) { }

---

Arguments

operator

1. Identifier

Does NOT support: Composition — Free-form Selection — Refinement — Replacement

left

1. (:into)
2. (:nearest)
3. (:and)
4. (:or)
5. (:not)
6. (:text)
7. (:kind)
8. (:replace)
9. (:replace-in)
10. (:capture)
11. (:ref)
12. (arr)
13. (attr)
14. (bool)
15. (call)
16. (child)
17. (comp)
18. (export)
19. (fun)
20. (id)
21. (id+)
22. (import)
23. (jsx)
24. (mem)
25. (null)
26. (num)
27. (obj)
28. (of)
29. (prop)
30. (regex)
31. (regex+)
32. (str)
33. (str*)
34. (str+)
35. (tpl)
36. (tpl*)
37. (var)

right

1. (:into)
2. (:nearest)
3. (:and)
4. (:or)
5. (:not)
6. (:text)
7. (:kind)
8. (:replace)
9. (:replace-in)
10. (:capture)
11. (:ref)
12. (arr)
13. (attr)
14. (bool)
15. (call)
16. (child)
17. (comp)
18. (export)
19. (fun)
20. (id)
21. (id+)
22. (import)
23. (jsx)
24. (mem)
25. (null)
26. (num)
27. (obj)
28. (of)
29. (prop)
30. (regex)
31. (regex+)
32. (str)
33. (str*)
34. (str+)
35. (tpl)
36. (tpl*)
37. (var)