Creation Pattern Select strategy
Live In-Memory Matrix Click cell to mutate
Target: [0][0]
1D Continuous Buffer (Float64Array)
Memory Locality: Contiguous
Index Mapping Formula:
buffer[row * N + col] = buffer[0 * 4 + 0] = buffer[0]
V8 Heap Identity Assertions
matrix[0] === matrix[1]
true
matrix[1] === matrix[2]
true
Are rows independent allocations?
NO (SHARED REF)
V8 Heap Inspector Memory Layout
ALLOCATED HEAP OBJECTS
EXECUTION TELEMETRY
Total Heap Allocations:
1 Array Buffer
Row Pointer References:
3 referencing #0x7F10
Sparse Array Holes:
0 holes
Estimated Memory Overhead:
~120 bytes
CPU Cache Locality:
Pointer Chasing (Poor)
Uber Interview Golden Answer:
"Use
Array.from({length: m}, () => new Array(n).fill(0)). The callback runs once per row to allocate distinct arrays. The inner fill(0) is safe because 0 is a primitive value copied by value, not reference."