uh

.gitignore

@@ -1,2 +1,3 @@
 /target
 Cargo.lock
+.DS_Store

README.md

@@ -13,14 +13,21 @@ use bad_optics::{
 fn main() {
     let a = ((1, 2), 3);
 
-    // combine lenses
+    // use view to access inside the tuple
+    let res = view(_0, a);
+    assert_eq!(res, (1, 2));
+
+    let res = view(_1, a);
+    assert_eq!(res, 3);
+
+    // you can combine lenses
     let lens = _0 + _1;
 
     // use the view function to access
     let res = view(lens, a);
     assert_eq!(res, 2);
 
-    // call the lens as a function
+    // you can also call the lens as a function
     let res = lens(a);
     assert_eq!(res, 2);
 
@@ -32,7 +39,7 @@ fn main() {
     let a = set(lens, a, 5);
     assert_eq!(a, ((1, 5), 3));
 
-    // call the lens as a function to modify the value
+    // you can also call the lens as a function to modify the value
     let res = lens(a, |v| v + 1);
     assert_eq!(res, ((1, 3), 3));
 }

examples/main.rs

@@ -6,14 +6,21 @@ use bad_optics::{
 fn main() {
     let a = ((1, 2), 3);
 
-    // combine lenses
+    // use view to access inside the tuple
+    let res = view(_0, a);
+    assert_eq!(res, (1, 2));
+
+    let res = view(_1, a);
+    assert_eq!(res, 3);
+
+    // you can combine lenses
     let lens = _0 + _1;
 
     // use the view function to access
     let res = view(lens, a);
     assert_eq!(res, 2);
 
-    // call the lens as a function
+    // you can also call the lens as a function
     let res = lens(a);
     assert_eq!(res, 2);
 
@@ -25,7 +32,7 @@ fn main() {
     let a = set(lens, a, 5);
     assert_eq!(a, ((1, 5), 3));
 
-    // call the lens as a function to modify the value
+    // you can also call the lens as a function to modify the value
     let res = lens(a, |v| v + 1);
     assert_eq!(res, ((1, 3), 3));
 }

src/lib.rs

@@ -58,12 +58,12 @@ pub fn over<T, L: LensOver<T>>(_lens: L, thing: T, f: impl FnOnce(L::Field) -> L
     L::over(thing, f)
 }
 
-// TODO add fn impls
-
 // TODO add third_from_tuple, etc
 
 // TODO array traversals
 
+// TODO something for structs
+
 // TODO make over work with changing types
 
 mod combinations;
@@ -163,6 +163,10 @@ mod tests {
         assert_eq!(_0(a, |v| v + 1), (2, 2));
 
         let a = ((1, 2), 3);
+
+        let res = _0(a);
+        assert_eq!(res, (1, 2));
+
         let lens = _0 + _1;
 
         let res = lens(a);