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CDMem.md

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Call Data vs Memory

Let us assume that a dynamic array, myArray has the storage location memory. When the function addMem gets called externally, the array values are kept in calldata and copied to memory during ABI decoding. And during the for loop, arr[i] accesses the value in memory using a mload. This is an inefficient way of accessing array data values.

Preview

Testing on the CDMem.t.sol file,

    Running 2 tests for test/CDMem.t.sol:CDMemTest
    [PASS] testAddCD() (gas: 120)
    [PASS] testAddMem() (gas: 142)
    Test result: ok. 2 passed; 0 failed; finished in 396.18µs

Guidelines

Use calldata instead of memory for function parameters