Maximizing Efficiency: Strategies for Optimizing Gas Usage in Solidity Smart Contracts Smart contracts are an essential part of the Ethereum network, and their performance is critical to the overall health of the ecosystem. One of the key factors affecting smart contract performance is the cost of executing code, which is…

Developing Ethereum smart contracts can be challenging, especially when it comes to optimizing the code for gas usage. Gas is a fee that is required to execute a smart contract and it is paid in Ether. When developing a smart contract, it is important to consider the gas cost as…

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The short answer to that is Yes. Here is an example: var sum = 0; function addThree() { sum = sum + 3; } //var=3 // Only change code below this line function addFive(){ sum = sum +5 } //var sum=8 // Only change code above this line addThree(); console.log(sum) addFive(); console.log(sum) Without the use of the var keyword and hence being undefined, the variable sum inside functions addThree() and addFive() becomes a global variable meaning that once the value of sum changes inside the addThree() function it is also gets changed in the global variable which now becomes 3. The same is repeated after the function addFive()

Where you have 2 variables with the same name i.e in a global scope and another on in a function(local scope); Inside that function the local variable takes precedence. Example: var someVar = “Head” function myFun(){ var someVar = “Hat” return someVar } console.log(myFun()) This code will print out “Hat” which is in the local scope

There’s usually a lot of misunderstanding surrounding the undefined variable so I am going to attempt to demystify it by sharing some knowledge around this. When javascript values are undeclared they have an initial value of undefined e.g var myVar; -has a value of undefined If you do a mathematical operation on an undefined variable you will get a NaN i.e Not a Number If you concatenate a string with an undefined variable you will get a literal string of undefined.