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I see the benefit of using interpolated strings, in terms of readability:
string myString = $"Hello { person.FirstName } { person.LastName }!" over a concatenation done this way:
string myString = "Hello " + person.FirstName + " " person.LastName + "!"; The author of this video tutorial claims that the first one makes better use of memory.
How come?
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Concatenation allows you to combine to strings together and it only works on two strings. Swift uses string interpolation to include the name of a constant or variable as a placeholder in a longer string, and to prompt Swift to replace it with the current value of that constant or variable.
In C, the strcat() function is used to concatenate two strings. It concatenates one string (the source) to the end of another string (the destination). The pointer of the source string is appended to the end of the destination string, thus concatenating both strings.
Each time strcat calls, the loop will run from start to finish; the longer the string, the longer the loop runs. Until the string is extensive, the string addition takes place very heavy and slow.
The author doesn't actually say that one makes better use of memory than the other. It says that the one method "makes good use of memory" in the abstract, which, by itself, doesn't really mean much of anything.
But regardless of what they said, the two methods aren't going to be meaningfully different in their implementation. Neither is going to be meaningfully different from the other in terms of memory or time.
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