[TIL] more about JS

We are working with Visual Studio Code(VS Code) and Node.js for pre-onboarding week.

Things I keep making mistakes and things that make sure while using these:

• SAVE THE CODE (command + s)
• command 'node somthing(file).js' which means to run something.js file.

Things that I need to make sure:

• The difference btw Prefix and Postfix

• The For loop
  Loops are kind of handy, if you want to run the same code over and over again, each time with a different value.

for (expression(1); expression(2); expression(3)) {
 // code block to be executed
}

First, you can divide this part into 3 parts as below:

• Expression(1) is executed (one time) before the execution of the code block.

• Expression(2) defines the condition for executing the code block.

• Expression(3) is executed (every time) after the code block has been executed.

for (let i = 0; i < 5; i++) {
  console.log(`${i}번째 반복입니다.`)
}

From the example above, you can read:

Expression(1) sets a let before the loop starts (let i = 0).

Expression(2) defines the condition for the loop to run (i must be less than 5).

Expression(3) increases a value (i++) each time the code block in the loop has been executed.