By putting braces around every block of code you write, you ensure that future edits won’t introduce bizarre bugs. If you have a one-line if statement: if(condition) execute(); you should still surround execute(); with braces as follows: if(condition) { execute(); } Now, if you want to go back to the code in future and add a second instruction if(condition) { execute(); execute2(); } you don’t have to worry about putting in the braces.