Fix examples

README.md

@@ -120,7 +120,7 @@ Lists are sequential collections. They can be built by grouping values with pare
 ```dust
 list = (true, 42, "Ok");
 
-assert_eq(list.0, true);
+assert_equal(list.0, true);
 ```
 
 ### Maps
@@ -132,7 +132,7 @@ reminder.message = "Buy milk";
 reminder.tags = ("groceries", "home");
 
 json = to_json(reminder);
-append_to_file(json, "info.txt");
+append(json, "info.txt");
 ```
 
 ### Tables
@@ -170,7 +170,7 @@ insert(
 
 assert_eq(length(animals.all), 6);
 
-by_name = sort_by(animals, "name");
+sorted = sort(animals, "name");
 ```
 
 ### The Yield Operator
@@ -187,7 +187,7 @@ This can be useful when working on the command line but to make a script easier
 json = download("https://api.sampleapis.com/futurama/characters");
 from_json(json)
     -> select(input, "name");
-    -> get(input, 4)
+    -> input.4
 ```
 
 ### Functions
@@ -201,7 +201,7 @@ say_hi = 'output "hi"';
 add_one = 'input + 1';
 
 say_hi();
-assert_eq(add_one(3), 4);
+assert_equal(add_one(3), 4);
 ```
 
 This function simply passes the input to the shell's standard output.
@@ -217,8 +217,8 @@ organize them.
 math.add = 'input.0 + input.1';
 math.subtract = 'input.0 - input.1';
 
-assert_eq(math.add(2, 2), 4);
-assert_eq(math.subtract(100, 1), 99);
+assert_equal(math.add(2, 2), 4);
+assert_equal(math.subtract(100, 1), 99);
 ```
 
 ### Time

src/tools/collections.rs

@@ -73,6 +73,33 @@ impl Tool for String {
     }
 }
 
+pub struct Replace;
+
+impl Tool for Replace {
+    fn info(&self) -> ToolInfo<'static> {
+        ToolInfo {
+            identifier: "replace",
+            description: "Replace all occurences of a substring in a string.",
+            group: "collections",
+            inputs: vec![ValueType::ListExact(vec![
+                ValueType::String,
+                ValueType::String,
+                ValueType::String,
+            ])],
+        }
+    }
+
+    fn run(&self, argument: &Value) -> Result<Value> {
+        let argument = self.check_type(argument)?.as_list()?;
+        let target = argument[0].as_string()?;
+        let to_remove = argument[1].as_string()?;
+        let replacement = argument[2].as_string()?;
+        let result = target.replace(to_remove, replacement);
+
+        Ok(Value::String(result))
+    }
+}
+
 pub struct Count;
 
 impl Tool for Count {

src/tools/mod.rs

@@ -50,13 +50,14 @@ pub mod time;
 /// Master list of all tools.
 ///
 /// This list is used to match identifiers with tools and to provide info to the shell.
-pub const TOOL_LIST: [&'static dyn Tool; 49] = [
+pub const TOOL_LIST: [&'static dyn Tool; 50] = [
     &collections::Count,
     &collections::CreateTable,
     &collections::Insert,
     &collections::Rows,
     &collections::Select,
     &collections::String,
+    &collections::Replace,
     &collections::Transform,
     &collections::Where,
     &command::Bash,