YogeshChauhan.com
How to concatenate variable with string in Swift?
March 2, 2020

String interpolation is a way to construct a new String value from a mix of constants, variables, literals, and expressions by including their values inside a string literal.

You can use string interpolation in both single-line and multiline string literals. Each item that you insert into the string literal is wrapped in a pair of parentheses, prefixed by a backslash ():


let multiplier = 3
let message = "(multiplier) times 2.5 is (Double(multiplier) * 2.5)"
// message is "3 times 2.5 is 7.5"

In the example above, the value of multiplier is inserted into a string literal as (multiplier). This placeholder is replaced with the actual value of multiplier when the string interpolation is evaluated to create an actual string.

The value of multiplier is also part of a larger expression later in the string. This expression calculates the value of Double(multiplier) * 2.5 and inserts the result (7.5) into the string. In this case, the expression is written as (Double(multiplier) * 2.5) when it’s included inside the string literal.

You can use extended string delimiters to create strings containing characters that would otherwise be treated as a string interpolation. For example:


print(#"Write an interpolated string in Swift using (multiplier)."#)
// Prints "Write an interpolated string in Swift using (multiplier)."

To use string interpolation inside a string that uses extended delimiters, match the number of number signs before the backslash to the number of number signs at the beginning and end of the string. For example:


print(#"6 times 7 is #(6 * 7)."#)
// Prints "6 times 7 is 42."
dreamhost

Leave a Reply

Most Read

#1 How to check if radio button is checked or not using JavaScript? #2 How to set opacity or transparency using CSS? #3 Pagination in CSS with multiple examples #4 How to make HTML form interactive and using CSS? #5 Solution to “TypeError: ‘x’ is not iterable” in Angular 9 #6 How to uninstall Cocoapods from the Mac OS?



Recently Posted

Feb 27 WordPress: How to display slider repeater fields in ACF? Feb 26 Simple Page Hit Counter in PHP Feb 26 Here’s what we can do with PHP date() function Feb 25 How to set default timezone using PHP? Feb 24 WordPress: How to loop through a repeater field in ACF? Feb 24 How to get ACF values from custom post type?



You might also like these

Safe Practice to add Links to cross-origin destinationUI/UXHow to apply style to a specific child element using CSS?CSSLearn to Implement Estimated Reading Time using PHP Part 2: Final Implementation with Source CodePHPPostgreSQL BETWEENPostgresHow to merge arrays in JavaScript?JavaScriptHow to Display Related Posts in WordPress?WordPress