From Test-Scratch-Wiki
Working with strings can be difficult with limited options, but there are almost always workarounds. In a string, a character can be added. This tutorial explains the concept of inserting a character in a string. The scripts below are custom blocks that are easier to work with. There are two basic methods for performing this: the Variable Method and List Method.
Note: | the scripts below should be run without screen refresh, which can be found in the custom block's edit menu, so it generates instantly |
Note: | for these two methods, the custom block input (string) must have the variable itself dragged into it for this to work, instead of the name of typing the variable in, because then the name itself is rendered as the string instead of the variable's characters |
Programming
Variables Method
In this method, assume the following:
- (changer) is the variable used to work with the transition of the character to the desired one
- (item#) is the variable used to iterate through the string
- (string) is the string input in the custom block that represents the character being inserted
define add (new character) at (character#) of string //"string" is text to notify you what variable you change set [changer v] to [] //this is blank set [item# v] to (1) //so the string transfer begins with the first character repeat ((character#) - (1)) //repeats the amount of characters before the one going to be inserted set [changer v] to (join (changer) (letter (item#) of (string))) //adds the current character to "changer" change [item# v] by (1) //moves on to the next character end set [changer v] to (join (changer) (new character)) //adds the new character repeat ((length of (string)) - (character#) //repeats the amount of characters after the inserted one set [changer v] to (join (changer) (letter (item#) of (string))) //adds the current character to "changer" change [item# v] by (1) //moves on to the next character end set [string v] to (changer) //stores the new string in the specified variable add [] at () of string //this is what the custom block looks like
List Method
For this method, assume the following:
- (item#) is the variable used to iterate through the string
- (letters) is the list which separates each letter of the string and modify it
- (string) is the result of adding the new character to the string
define add (new character) at (letter #) of (string) //"string" is a string input that represents the character being inserted set [item# v] to (1) //the transferring of the variable's letters to the list starts with the first character delete [all v] of [letters v] //clears the list of letters repeat (length of (string)) //repeats the amount of characters there are in the variable represented by the input (string) add (letter (item#) of (string)) to [letters v] //adds the current letter as a new item to the list change [item# v] by (1) //moves on to the next letter end insert (new character) at (letter #) of [letters v] //inserts the new character set [string v] to (letters) //the variable is then set to the list of letters. (letters) is a combination of each letter of the list in own string add [] at () of [] //this is what the custom block looks like