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For example:
public string ReplaceXYZ(string text)
{
string replacedText = text;
replacedText = replacedText.Replace("X", String.Empty);
replacedText = replacedText.Replace("Y", String.Empty);
replacedText = replacedText.Replace("Z", String.Empty);
return replacedText;
}
If I were to call "ReplaceXYZ" even for strings that do not contain "X", "Y", or "Z", would 3 new strings be created each time?
I spotted code similar to this in one of our projects. It's called repeatedly as it loops through a large collection of strings.
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Java String replace() method replaces every occurrence of a given character with a new character and returns a new string. The Java replace() string method allows the replacement of a sequence of character values.
The replace() method returns a new string with one, some, or all matches of a pattern replaced by a replacement . The pattern can be a string or a RegExp , and the replacement can be a string or a function called for each match. If pattern is a string, only the first occurrence will be replaced.
To replace a character in a String, without using the replace() method, try the below logic. Let's say the following is our string. int pos = 7; char rep = 'p'; String res = str. substring(0, pos) + rep + str.
The Basics of Replacing a String JavaScript strings are immutable, so the String#replace() function returns the modified string. It does not modify the existing string. Generally, the first argument to replace() is called the pattern, and the 2nd argument is called the replacement.
It does not return a new instance if there is nothing to replace:
string text1 = "hello world", text2 = text1.Replace("foo", "bar");
bool referenceEqual = object.ReferenceEquals(text1, text2);
After that code executes, referenceEqual is set to true.
Even better, this behavior is documented:
If oldValue is not found in the current instance, the method returns the current instance unchanged.
Otherwise, this would be implementation-dependent and could change in the future.
Note that there is a similar, documented optimization for calling Substring(0) on a string value:
If startIndex is equal to zero, the method returns the original string unchanged
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