diff --git a/examples/arrays.zr b/examples/arrays.zr
new file mode 100644
index 0000000..3af352d
--- /dev/null
+++ b/examples/arrays.zr
@@ -0,0 +1,10 @@
+func main[] : I64
+    let xs: Array = Array.new()
+    Array.push(xs, 5242)
+    Array.push(xs, 6533)
+    Array.push(xs, 4574)
+
+    for i in 0:Array.size(xs)
+        xs
+        |> Array.nth(i)
+        |> print_i64()
\ No newline at end of file
diff --git a/examples/euler12.zr b/examples/euler12.zr
index 988c239..2afa3d2 100644
--- a/examples/euler12.zr
+++ b/examples/euler12.zr
@@ -1,5 +1,5 @@
 func num_divisors[n: I64] : I64
-    let end: I64 = isqrt(n)
+    let end: I64 = Math.isqrt(n)
 
     let result: I64 = 0
     for i in 1:end+1
@@ -13,7 +13,7 @@ func num_divisors[n: I64] : I64
 func main[] : I64
     let n: I64 = 0
     let i: I64 = 1
-    while 1
+    while true
         n = n + i
         if num_divisors(n) > 500
             print_i64(n)
diff --git a/examples/euler7.zr b/examples/euler7.zr
index 821b0fd..ec9e5ec 100644
--- a/examples/euler7.zr
+++ b/examples/euler7.zr
@@ -2,7 +2,7 @@ func main[] : I64
     let found: I64 = 0
 
     let i: I64 = 1
-    while 1
+    while true
         if Math.is_prime(i)
             found = found + 1
             if found == 10001
diff --git a/examples/euler8.zr b/examples/euler8.zr
index bf0f024..6a58314 100644
--- a/examples/euler8.zr
+++ b/examples/euler8.zr
@@ -7,7 +7,7 @@ func main[] : I64
         let s: I64 = 1
         let j: I64 = 0
         while j < 13
-            s = s * Char.to_i64(nth(n, i + j))
+            s = s * Char.to_i64(String.nth(n, i + j))
             j = j + 1
         if s > out
             out = s
diff --git a/src/codegen_x86_64.rs b/src/codegen_x86_64.rs
index effbc66..2867a7a 100644
--- a/src/codegen_x86_64.rs
+++ b/src/codegen_x86_64.rs
@@ -58,7 +58,7 @@ macro_rules! emit {
 }
 
 static REGISTERS: [&str; 6] = ["rdi", "rsi", "rdx", "rcx", "r8", "r9"];
-static TYPES: [&str; 5] = ["I64", "String", "Bool", "Ptr", "Char"];
+static TYPES: [&str; 6] = ["I64", "String", "Bool", "Ptr", "Char", "Array"];
 
 pub struct CodegenX86_64 {
     output: String,
@@ -97,6 +97,8 @@ impl CodegenX86_64 {
             "
 section .text
 extern malloc
+extern calloc
+extern realloc
 extern free
 extern printf
 extern sprintf
@@ -117,11 +119,11 @@ extern exit
 extern gettimeofday
 copystr equ strdup
 
-nth:
+String.nth:
     movzx rax, byte [rdi + rsi]
     ret
 
-set:
+String.set:
     mov [rdi + rsi], dl
     ret
 
@@ -142,7 +144,58 @@ time:
     pop rbx
     ret
 
-isqrt:
+Array.new:
+    mov rdi, 1
+    mov rsi, 24
+    jmp calloc
+
+Array.nth:
+    mov rax, [rdi]
+    mov rax, [rax + rsi*8]
+    ret
+
+Array.push:
+    push r14
+    push rbx
+    push rax
+    mov r14, rsi
+    mov rbx, rdi
+    mov rax, [rdi]
+    mov rcx, [rdi + 16]
+    cmp rcx, [rdi + 8]
+    jne .no_realloc
+    lea rdx, [rcx + rcx]
+    mov rsi, 4
+    test rcx, rcx
+    cmovnz rsi, rdx
+    mov [rbx + 8], rsi
+    shl rsi, 3
+    mov rdi, rax
+    call realloc
+    mov [rbx], rax
+    mov rcx, [rbx + 16]
+.no_realloc:
+    mov [rax + rcx*8], r14
+    inc qword [rbx + 16]
+    add rsp, 8
+    pop rbx
+    pop r14
+    ret
+
+Array.size:
+    mov rax, [rdi + 16]
+    ret
+
+Array.free:
+    push rbx
+    mov rbx, rdi
+    mov rdi, [rdi]
+    call free
+    mov rdi, rbx
+    pop rbx
+    jmp free
+
+Math.isqrt:
     xor rax, rax
     mov rcx, 1
     mov rbx, rdi
@@ -400,7 +453,12 @@ isqrt:
                 }
                 TokenType::String => {
                     // TODO: actual string parsing in the tokenizer
-                    let value = &token.lexeme[1..token.lexeme.len() - 1].replace("\\n", "\n");
+                    let value = &token.lexeme[1..token.lexeme.len() - 1]
+                        .replace("\\n", "\n")
+                        .replace("\\r", "\r")
+                        .replace("\\t", "\t")
+                        .replace("\\033", "\x1b")
+                        .replace("\\0", "\0");
 
                     if value.is_empty() {
                         emit!(&mut self.data_section, "    S{} db 0", self.data_counter);
diff --git a/src/std.zr b/src/std.zr
index 1c8e8e4..10ee35d 100644
--- a/src/std.zr
+++ b/src/std.zr
@@ -23,12 +23,10 @@ func strrev[s: String] : String
     let len: I64 = strlen(s)
     let out: String = malloc(len + 1)
 
-    let i: I64 = 0
-    while i < len
-        let c: Char = nth(s, len - i - 1)
-        set(out, i, c)
-        i = i + 1
-    set(out, len, 0)
+    for i in 0:len
+        let c: Char = String.nth(s, len - i - 1)
+        String.set(out, i, c)
+    String.set(out, len, 0)
     return out
 
 func IO.read_file[path: String]: String
@@ -43,7 +41,7 @@ func IO.read_file[path: String]: String
     let buffer: String = malloc(size + 1)
 
     let n: I64 = fread(buffer, 1, size, file)
-    set(buffer, n, 0)
+    String.set(buffer, n, 0)
     return buffer
 
 func Char.to_i64[c: Char]: I64
@@ -78,10 +76,8 @@ func Math.abs[n: I64] : I64
 
 func Math.pow[b: I64, e: I64] : I64
     let out: I64 = 1
-    let i: I64 = 0
-    while i < e
+    for i in 0:e
         out = out * b
-        i = i + 1
     return out
 
 func Math.lcm[a: I64, b: I64] : I64
diff --git a/test.zr b/test.zr
index d3f446a..c4bc77a 100644
--- a/test.zr
+++ b/test.zr
@@ -1,5 +1,6 @@
 func run_test[x: String] : I64
-    printf("Building %s...", x)
+    // TODO: escape sequences
+    printf("\033[93mBuilding %s...\033[0m", x)
     let cmd: String = concat("./target/release/zern examples/", x)
 
     let build_start_time: I64 = time()
@@ -15,12 +16,12 @@ func run_test[x: String] : I64
         exit(1)
     let run_end_time: I64 = time()
     
-    printf("Running %s... %ldms\n", x, run_end_time - run_start_time)
+    printf("\033[93mRunning %s...\033[0m %ldms\n", x, run_end_time - run_start_time)
 
 func main[] : I64
     system("cargo build --release")
 
-    // TODO
+    // TODO: listdir
     run_test("euler1.zr")
     run_test("euler2.zr")
     run_test("euler3.zr")