The stack is faster because all free memory is always contiguous. this is bad!) OR garbage collecting (identifying at runtime when memory is no longer in scope and deallocating it). Sometimes the memory allocator will perform maintenance tasks such as defragmenting allocated memory (fragmenting: when small free blocks are scattered, but when request for large memory allocation comes, there is no free memory left in heap even though small free blocks combined may be large. The heap memory is allocated at the run time. Heap allocation requires manual housekeeping of what memory is to be reserved and what is to be cleaned. Heap: In heap there is no particular order to the way the items are placed. The size of the memory allocated to the function and it's variable on the stack is known to the compiler and as soon as the function call is over, the memory is de-allocated. The stack is always reserved in LIFO (last in first out), the most recent block added will be freed(marked as unused) first. When a function returns, the block becomes unused and can be used the next time any function is called (in the world of JS this is similar to function's execution context). Initial stack memory allocation is done by the OS when the program is compiled. This block of memory is referred to as a stack frame. When a function in called, a block is reserved on top of the stack for local variables and some bookkeeping data. Stack: The stack is a memory set aside as a scratch space for the execution of thread. If you are familiar with typical memory representation of C, you must already be aware of these two terms. To understand how memory allocations in Go works, we need to understand the types of memories in programming context, which are Stack and Heap.
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