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String Interpolation in JavaScript
What is String Interpolation?
String interpolation is a process in JavaScript that is used to embed an expression, variable, or function into a
string of text. With the help of this we can embed an expression and to embed an expression we use the template
literals or backticks (`) instead of normal quotes.
The template literal syntax has a dollar sign that is followed by curly brackets in JavaScript. We can write the
expression or mathematical calculation inside the curly brackets.
In simple words, by using a String interpolation we can make multi-line strings without the need of an escape
character.
Syntax
The syntax of string interpolation is as follows:
div class="container">
string text`
`string text ${expression} string text`
What are template literals in JavaScript?
In JavaScript, template literals provide an easy syntax to include the expression within the JavaScript string.
With the help of template literals, we can encompass a variable or an expression with the usage of $expression
syntax this technique simplifies the concatenating strings and expressions and makes the code greater readable
and clean to keep.
Complex Expressions
In JavaScript, template literals aren't handiest restrained to simple variables. We can include more complicated
expressions in the placeholder together with mathematics operations or feature calls.
Multiline Strings
In JavaScript, there may be another benefit of template literals they guide multiline strings without the need
for concatenation or escaping newline characters.
Tagged template literals
In JavaScript, we can parse template literals with a feature with the usage of tagged template literals. In this primary argument, the tag feature is an array of string values and the values of the expressions are subsequent arguments. Tagged template literals may be used for more superior string manipulation obligations like localization, a styled thing in web improvement, or custom string processing logic.
JavaScript string interpolation characteristic considerably complements the manner developers work with strings, and additionally offers a flexible and efficient method to create dynamic content.
Use case of String interpolation
There are some use cases of string interpolation in JavaScript. Some are as follows:
Interpolating Variables
In JavaScript, this is one of the most common use cases of string interpolation that is used to insert the values of variables into a string. In simple words, we can directly include the variable inside the template literals using the ${variable} syntax without using the concatenation.
Evaluating Expressions
In JavaScript, with the use of string interpolation, we can evaluate the expression and we can insert the result into a string. This can be helpful when we have to perform the calculations or we need to dynamically generate content in JavaScript.
Calling functions
In JavaScript, we can call the function within the template literal and we can use the returned value in the interpolated string. With the help of this, we can include dynamic information or perform the complex logic within the string.
Conditional Interpolation
In JavaScript, with the help of string interpolation, we can handle the conditional statement or expressions. In simple words, with the use of string interpolation, we can include certain values or messages that are based on the conditions.
Nested interpolation
In JavaScript, we can use the string interpolation for nested within the other interpolation string or expressions, which can create a more complex string.
In summary, if we overuse these features or we use these features in the wrong situation it can create more mess. In simple words, it can make the code harder to read. These features are more suitable for complex string manipulations, and alternative approaches like StringBuilder.
Example
// Define a function called `add` that takes two arguments, `a` and `b`, and returns their sum.
function add(a, b) {
// Return the sum of `a` and `b`.
return a + b;
}
// Define some variables.
const num1 = 5;
const num2 = 10;
// Use the `add` function to calculate the sum of `num1` and `num2`.
const sum = add(num1, num2);
// Print the result to the console.
console.log(`The sum of ${num1} and ${num2} is ${sum}.`);
output
PS D:JS> node "d:jsmyFunction.js"
the sum of 5 and 10is 15.
In this example, we define a function called add that takes two arguments a and b, and returns their sum. We then define two variables num1 and num2 and use the add function to calculate their sum. Finally, we print the result to the console using the console.log method.
