Definition off ES6 Template Strings
ES6 template strings were referred to as template strings prior to ES6. Template strings are contained by the backtick (‘ ‘) character. The dollar symbol and curly braces ($(expression)) are used to signify placeholders in template strings. If we wish to use an expression inside the backticks, we can put that expression in the ($(expression). In ECMAScript 2015/ES6, a new feature called template literals was introduced. It makes creating multiline strings and performing string interpolation simple. Embedded expressions are possible with template literals, which are string literals.
What are ES6 template strings?
- With JavaScript ES2015 (ES6), Template strings are introduced to make string handling easier and more understandable.
- It enables us to embed expressions (expression interpolation) within a string declaration, handle multiline strings, and produce “tagged template literals,” a more complex kind of template string.
Below is the syntax of ES6 template strings is as follows. The syntax contains the string value.
Syntax:
Var str = ‘value of string’;
In the above syntax value of the string is any value which was we have assigned to the string in our program.
- To create a multiline string from a standard string, we must employ the escape sequence n. However, there is no need to use n in template literals because the string ends only when the backtick (‘) character is encountered.
- Tagged templates are a type of template string that is more complex.
- The tag function’s first parameter is an array of string values, while the subsequent arguments are expression-related. To call a literal, no parenthesis () is needed.
- Raw strings can be accessed using the template literal raw method. Additionally, the string.raw() technique is identical to the default template function in that it creates raw strings. It enables us to write the backslashes as if they were literals in a regular expression.
- The string. raw() method is used to display strings with no backslash character interpretation. It’s also useful for printing subdirectory locations in Windows without having to use a bunch of backslashes.
Embed ES6 template strings
- Template strings are a syntactic feature in ECMAScript 6 that allows JavaScript to develop embedded domain-specific languages (DSLs). “Quasi-literals” was the initial name for them.
- In that it provides a straightforward syntax for producing data, a template is analogous to a string literal and a regular expression literal.
- Template literals are string literals that allow backtick characters (‘) to be used as embedded expressions. We can use them with multi-line strings and string interpolation. Previously, these were known as template strings.
- If we choose the latter method, it’s because we will have to wait until runtime for all of the necessary ingredients. In most cases, we concatenate regular expression pieces with text that must be matched verbatim. The latter has to be correctly evaded.
- In most cases, we are using a single quote declaration by default, and a double-quote declaration if the string contained single quotations. We were not to use escape characters like in a and b.
The below example shows the embed ES6 template string is as follows. We have added 15 and 25 numbers.
Example
console.log(`Addition is 15 + 25 = ${15 + 25}`);
Output:
ES6 template strings Function call
- Instead of utilizing single or double quotes, template literals are contained with the backtick”.
- The below example shows print the template string using template literal or string are as follows.
Example –
console.log(`ES6 template strings`);
- $functionName() is a template literal that can be used to call a function. We’re invoking a function with a template literal in the below example as follows.
Example –
function addition(a, b) {
return a + b;
}
console.log (`Addition is 15 + 25 = ${addition(15, 25)}`);
- In the above example, $addition (15, 25) is evaluated in the preceding code. As a result, it uses the 15 and 25 arguments to invoke the addition method.
- The sum is returned by the addition function. As a result, we substitute 5 for the expression and obtain the actual result.
- In the below example we are invoking a function to multiply two numbers, we are using a and b variables in multiply function.
Example –
function multiply(a, b) {
return a * b;
}
console.log(`Multiplication is 15 * 25 = ${multiply(15, 25)}`);
In the above example, $multiply (15, 25) is evaluated in the preceding code. As a result, it uses the 15 and 25 arguments to invoke the multiply method.
The multiplication is returned by the multiply function. As a result, we multiply the expression and obtain the actual result.
Multi-line strings
- Suppose if we need to print multiple lines in our code we can ES6 template string. The below example shows multiple line codes with double-quote are as follows. The output by using double-quote string in multiline is as follows.
Example
var output = "Student first name.\n" +
"Student last name.";
console.log(output);
\
- In the above example, we have used a double quote to display the multiline string. In the below example, we are using template literal to display the multiline string are as follows.
Example
var output = `Student first name.
Student last name.`;
console.log(output);
- In the above example, we have seen that we have not used any new line character for terminating the line. After entering the character in the new line template literal will be considered as a new line.
Creating using Template Strings
- The template literal is a brand-new ES6 feature. This is a unique sort of string that simplifies the creation of complex strings.
- String interpolation features and multi-line strings are both possible with template literals.
- The below example shows create string by using template strings are as follows. In the below example, we have defined stud and stud1 variables.
Example
const stud1 = {
stud_name: "ABC",
age: 5
};
const stud = `Hi, student name is ${stud1.stud_name}!
I am ${stud1.age} years.`;
console.log(stud);
Conclusion
ES6 template strings enable us to embed expressions within a string declaration, handle multiline strings, and produce “tagged template literals,” a more complex kind of template string. ES6 template strings were referred to as template strings prior to ES6. Template strings are contained by the backtick (‘ ‘) character.
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