diff --git a/lectures/code_snippets/map.cpp b/lectures/code_snippets/map.cpp
new file mode 100644
index 0000000..acf56dc
--- /dev/null
+++ b/lectures/code_snippets/map.cpp
@@ -0,0 +1,10 @@
+#include <map>
+
+int main() {
+
+  std::map<std::string, double> particle_mass;
+
+  particle_mass["mars"] = 6.4171e23;
+  particle_mass["sun"] = 1.9885e30;
+  particle_mass["copper"] = 1.0552061e-25;
+}
\ No newline at end of file