String (computer science)

String interpolation

In computer programming, string interpolation (or variable interpolation, variable substitution, or variable expansion) is the process of evaluating a string literal containing one or more placeholders, yielding a result in which the placeholders are replaced with their corresponding values. It is a form of simple template processing or, in formal terms, a form of quasi-quotation (or logic substitution interpretation). The placeholder may be a variable name, or in some languages an arbitrary expression, in either case evaluated in the current context. String interpolation is an alternative to building string via concatenation, which requires repeated quoting and unquoting; or substituting into a printf format string, where the variable is far from where it is used. Compare: apples = 4print("I have ${apples} apples.") # string interpolationprint("I have " + apples + " apples.") # string concatenationprint("I have %s apples.", apples) # format string Two types of literal expression are usually offered: one with interpolation enabled, the other without. Non-interpolated strings may also escape sequences, in which case they are termed a raw string, though in other cases this is separate, yielding three classes of raw string, non-interpolated (but escaped) string, interpolated (and escaped) string. For example, in Unix shells, single-quoted strings are raw, while double-quoted strings are interpolated. Placeholders are usually represented by a bare or a named sigil (typically $ or %), e.g. $apples or %apples, or with braces, e.g. {apples}, sometimes both, e.g. ${apples}. In some cases additional formatting specifiers can be used (as in printf), e.g. {apples:3}, and in some cases the formatting specifiers themselves can be interpolated, e.g. {apples:width}. Expansion of the string usually occurs at run time. Language support for string interpolation varies widely. Some languages do not offer string interpolation, instead using concatenation, simple formatting functions, or template libraries. String interpolation is common in many programming languages which make heavy use of string representations of data, such as Apache Groovy, Julia, Kotlin, Perl, PHP, Python, Ruby, Scala, Swift, Tcl and most Unix shells. (Wikipedia).

Video thumbnail

Programming Terms: String Interpolation

In this programming terms video, we will be going over string interpolation. String interpolation is the process of evaluating a string containing one or more placeholders and yielding a result in which the placeholders are replaced with their corresponding values. Let's take a look at thi

From playlist Programming Terms

Video thumbnail

stringr: String Interpolation

The stringr library is part of the R tidyverse and provides a range of convenience functions for working with character strings. In this lesson, we learn how to use stringr to string interpolation: filling values into a string based on stored variables, calculations, function calls and dat

From playlist stringr

Video thumbnail

Fun with Strings

Experimenting and seeing what we can do with strings

From playlist Computer Science

Video thumbnail

Using code to interrogate textual data | I’m a STRING. Ask me anything! | Coding tutorial

What's going on everyone. In this video 🎥, we will use JavaScript and PowerShell to see how we can build and interrogate strings using code 💻. Textual data inside computer programs is represented using sequences of characters that we call strings. So far in this series, we seen how stri

From playlist Data Science - Learn to code for beginners

Video thumbnail

Java Manipulating Strings

More videos like this online at http://www.theurbanpenguin.com We do quite a lot in this video so if you are new to Java you will get a lot out of this. First we revisit StringBuilder and the reverse method. Then looking at how we can assign non-string values to strings with concatenation

From playlist Java

Video thumbnail

stringr: String Matching

The stringr library is part of the R tidyverse and provides a range of convenience functions for working with character strings. In this lesson, we learn how to use stringr to do pattern matching: detecting whether certain substrings or string patterns (regular expressions) exist in text.

From playlist stringr

Video thumbnail

String Theory Overview

In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings. String theory describes how these strings propagate through space and interact with each other. On distance scales larger than

From playlist Physics

Video thumbnail

stringr: Basic String Manipulation

The stringr library is part of the R tidyverse and provides a range of convenience functions for working with character strings. In this first lesson of the stringr series, we look at several basic string manipulation functions. stringr Series Code Notebook: https://www.kaggle.com/hamelg

From playlist stringr

Video thumbnail

stringr: Sorting Strings

The stringr library is part of the R tidyverse and provides a range of convenience functions for working with character strings. In this lesson, we learn how to sort strings alphabetically using the stringr package. stringr Series Code Notebook: https://www.kaggle.com/hamelg/stringr-tuto

From playlist stringr

Video thumbnail

LambdaConf 2015 - What's New in Scala Marconi Lanna

"Programming in Scala", by Martin Odersky et al., is one of the most comprehensive and the de facto reference for Scala. However, the book, originally published in 2008 for Scala 2.7.2, has not been updated since its second edition in 2010, covering up until Scala 2.8.1. In the meantime, S

From playlist LambdaConf 2015

Video thumbnail

Angular 4 Data Binding | Two Way Data Binding in Angular 4 | Angular 4 Tutorial | Edureka

This is the 4th video of Angular 4 Tutorial series for beginners by Edureka. In this videos, you will learn how data binding works in Angular. Here, are the topics that will be covered in this complete Angular playlist: 1) Angular 4 Introduction : www.youtube.com/watch?v=R4wGCHzn6-Q 2)

From playlist Angular 4 Tutorial For Beginners [Edureka Free Course]

Video thumbnail

Introduction To Data Analytics With Pandas || Quentin Caudron

Data analytics in Python benefits from the beautiful API offered by the pandas library. With it, manipulating and analysing data is fast and seamless. In this workshop, we'll take a hands-on approach to performing an exploratory analysis in pandas. We'll begin by importing some real data.

From playlist Data Science

Video thumbnail

Python Strings Tutorial | How To Use Strings In Python | Python Tutorial | Python Training | Edureka

🔥Edureka Python Certification Training: https://www.edureka.co/python-programming-certification-training This Edureka video on 'Python Strings' will help you understand how we can use Strings in Python with various methods and operations. Following are the topics discussed: 00:00 - Introdu

From playlist Python Programming Tutorials | Edureka

Video thumbnail

COMP2041/COMP9041 - Manipulating Strings in Perl

COMP[29]041 Software Construction: Techniques and Tools Course Video: Manipulating Strings in Perl Featuring Jashank Jeremy UNSW Sydney

From playlist COMP2041/COMP9041 Software Construction: Techniques and Tools

Video thumbnail

Live CEOing Ep 353: Qualifiers for Entities & Wiki Entities in Wolfram Language

In this episode of Live CEOing, Stephen Wolfram discusses improvements to entities for Wolfram Language. If you'd like to contribute to the discussion in future episodes, you can participate through this YouTube channel or through the official Twitch channel of Stephen Wolfram here: https:

From playlist Behind the Scenes in Real-Life Software Design

Video thumbnail

ElixirConf 2015 - The road to intellij-elixir 1.0.0 By Luke Imhoff

Learn how naively copying a grammar file from one parser generator to another won't work. Go back to the beginning and learn about lexers vs parsers, but discover that the power of interpolation changes the computational complexity and forces the lexer to be a push-down automata instead of

From playlist ElixirConf 2015

Video thumbnail

MountainWest RubyConf 2015 - On Memory

by John Crepezzi Ruby doesn’t require developers to manage memory. It definitely makes our work less frustrating, but losing sight of the memory implications of our code, will get us into trouble! In this talk, I’ll go over common (and less common) memory pitfalls, why they work the way th

From playlist MWRC 2015

Video thumbnail

What is the goal of string theory?

Subscribe to our YouTube Channel for all the latest from World Science U. Visit our Website: http://www.worldscienceu.com/ Like us on Facebook: https://www.facebook.com/worldscienceu Follow us on Twitter: https://twitter.com/worldscienceu

From playlist Science Unplugged: String Theory

Related pages

ECMAScript | String literal | Julia (programming language) | Scala (programming language) | Quasi-quotation | Concatenation | TypeScript | Substitution (logic) | String (computer science)