PowerShell:
Об'єднання рядків
How to: (Як це зробити:)
# Using the + operator
$firstName = "Taras"
$lastName = "Shevchenko"
$fullName = $firstName + " " + $lastName
Write-Host $fullName # Output: Taras Shevchenko
# With the -f format operator
$greeting = "Hello, {0} {1}!"
Write-Host ($greeting -f $firstName, $lastName) # Output: Hello, Taras Shevchenko!
# Joining an array of strings with -join
$paths = 'C:\', 'Program Files', 'PowerShell'
$fullPath = $paths -join '\'
Write-Host $fullPath # Output: C:\Program Files\PowerShellDeep Dive (Поглиблене занурення):
Originally, computers just processed numerical data, but text processing became essential. String concatenation has been in programming languages since the early days, as a fundamental operation.
PowerShell has evolved from these concepts and adds its own spin. Using the + operator is straightforward but has performance considerations with large strings or in loops due to immutable string objects - each concatenation creates a new string.
The -f format operator and -join are alternatives to +. They can be cleaner and often faster. -f is perfect for templated strings while -join effortlessly brings arrays together.
Understanding the underlying .NET framework that PowerShell is based on is useful. String concatenation in .NET can involve multiple methods, such as StringBuilder class for heavy-duty operations, which PowerShell doesn’t expose directly but is accessible through .NET interoperability.