The Extract Variable refactoring puts the result of the selected expression into a variable. It declares a new variable and uses the expression as an initializer. The original expression is replaced with the new variable (see the examples below).
You can select the expression to be replaced with a variable yourself. You can as well use smart expression selection. In this case AppCode will help you select the desired expression.
Extracting variable in-place
To extract a variable using in-place refactoring, follow these steps
- In the editor, select the expression to be replaced with a variable. You can do that yourself or use the smart expression selection feature to let AppCode help you. So, do one of the following:
- If more than one occurrence of the selected expression is found, select Replace this occurrence only or Replace all occurrences in the Multiple occurrences found pop-up menu. To select the required option, just click it. Alternatively, use the Up and Down arrow keys to navigate to the option of interest, and press ⏎ to select it.
Specify the name of the variable. Do one of the following:
- Select one of the suggested names from the pop-up list. To do that, double-click the suitable name. Alternatively, use the Up and Down arrow keys to navigate to the name of interest, and ⏎ to select it.
- Edit the name by typing. The name is shown in the box with red borders and changes as you type. When finished, press⏎.