Solidity Programming Essentials

Rule 6

Assignments to storage variables from another memory variable always create a new copy.

A fixed array of uint stateArray is declared as a state variable. Within the getUInt function a local memory located fixed array of uint localArray is defined and initialized. The next line of code assigns localArray to stateArray. At this stage, the values in both the variables are the same. The next line of code changes one of the values in localArray to 10 and returns the element at same location from the stateArray1 array. The returned value is 2, illustrating that each variable maintains its own independent value as shown in the following screenshot:

A value type stateVar state variables is declared and initialized with value 20. Within the ...