Skip to main content

mutable_string_concatenation

⚡️ Optimize Concatenation with U+003CU+003C vs +​

Using U+003CU+003C (shovel) mutates the original string in place and is more memory-efficient than +, which allocates a new string each time. When building up large or iterative strings, prefer U+003CU+003C to reduce GC pressure and improve performance.

# Less efficient
result = ""
1000.times { |i| result = result + "Line #{i}\n" }

# More efficient
buffer = ""
1000.times { |i| buffer << "Line #{i}\n" }