Loop over multiple arrays simultaneously: Difference between revisions

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 =={{header|Zig}}==
+===Limit by minimum length===
+'''Works with''': 0.10.x
+<syntaxhighlight lang="zig">const std = @import("std");
+const arr1 = [_]u8{ 'a', 'b', 'c' };
+const arr2 = [_]u8{ 'A', 'B', 'C' };
+const arr3 = [_]u8{ '1', '2', '3' };
+pub fn main() std.fs.File.WriteError!void {
+    const stdout = std.io.getStdOut();
+    const stdout_w = stdout.writer();
+    const n = std.math.min3(arr1.len, arr2.len, arr3.len);
+    for (arr1[0..n]) |arr1_e, i| {
+        try stdout_w.print("{c} {c} {c}\n", .{ arr1_e, arr2[i], arr3[i] });
+    }
+}</syntaxhighlight>
+'''Works with''': 0.11.x, 0.12.0-dev.1381+61861ef39
+<syntaxhighlight lang="zig">const std = @import("std");
+const arr1 = [_]u8{ 'a', 'b', 'c' };
+const arr2 = [_]u8{ 'A', 'B', 'C' };
+const arr3 = [_]u8{ '1', '2', '3' };
+pub fn main() std.fs.File.WriteError!void {
+    const stdout = std.io.getStdOut();
+    const stdout_w = stdout.writer();
+    const n = @min(arr1.len, arr2.len, arr3.len);
+    for (arr1[0..n], arr2[0..n], arr3[0..n]) |arr1_e, arr2_e, arr3_e| {
+        try stdout_w.print("{c} {c} {c}\n", .{ arr1_e, arr2_e, arr3_e });
+    }
+}</syntaxhighlight>
+===Limit by length of first array===
+'''Works with''': 0.10.x
+This example will print up-to arr1 length (asserts that other arrays are at least that long).
+<syntaxhighlight lang="zig">const std = @import("std");
+const arr1 = [_]u8{ 'a', 'b', 'c' };
+const arr2 = [_]u8{ 'A', 'B', 'C' };
+const arr3 = [_]u8{ '1', '2', '3' };
+pub fn main() std.fs.File.WriteError!void {
+    const stdout = std.io.getStdOut();
+    const stdout_w = stdout.writer();
+    for (arr1) |arr1_e, i| {
+        try stdout_w.print("{c} {c} {c}\n", .{ arr1_e, arr2[i], arr3[i] });
+    }
+}</syntaxhighlight>
+'''Works with''': 0.11.x, 0.12.0-dev.1381+61861ef39
+<syntaxhighlight lang="zig">const std = @import("std");
+const arr1 = [_]u8{ 'a', 'b', 'c' };
+const arr2 = [_]u8{ 'A', 'B', 'C' };
+const arr3 = [_]u8{ '1', '2', '3' };
+pub fn main() std.fs.File.WriteError!void {
+    const stdout = std.io.getStdOut();
+    const stdout_w = stdout.writer();
+    for (arr1, 0..) |arr1_e, i| {
+        try stdout_w.print("{c} {c} {c}\n", .{ arr1_e, arr2[i], arr3[i] });
+    }
+}</syntaxhighlight>
+===Assert that arrays have equal length===
+'''Works with''': 0.11.x, 0.12.0-dev.1381+61861ef39
+This example will print up-to arr1 length (asserts that other arrays are exactly that long => asserts that lengths are equal).
 <syntaxhighlight lang="zig">const std = @import("std");
-const a1: []const u8 = &[_]u8{ 'a', 'b', 'c' };
+const arr1 = [_]u8{ 'a', 'b', 'c' };
-const a2: []const u8 = &[_]u8{ 'A', 'B', 'C' };
+const arr2 = [_]u8{ 'A', 'B', 'C' };
-const a3: []const u8 = &[_]u8{ '1', '2', '3' };
+const arr3 = [_]u8{ '1', '2', '3' };
-pub fn main() !void {
+pub fn main() std.fs.File.WriteError!void {
+    const stdout = std.io.getStdOut();
-    for (a1) |_, i|
+    const stdout_w = stdout.writer();
-        try std.io.getStdOut().writer().print("{c} {c} {d}\n", .{ a1[i], a2[i], a3[i] });
+    for (arr1, arr2, arr3) |arr1_e, arr2_e, arr3_e| {
+        try stdout_w.print("{c} {c} {c}\n", .{ arr1_e, arr2_e, arr3_e });
+    }
 }</syntaxhighlight>