This content originally appeared on DEV Community and was authored by Anjan Shomooder
Why do template strings exist?
Simply add multiple strings into a single string.
For example, If I ask you to add the string a and b. How would you do this?
const a = 'My name is Anjan Shomodder'
const b = 'I am a software engineer'
You might do this:
const combinedString = a + b
console.log(combinedString)
This will work. But what if you want to add a number to it. How would you write I am 20 years old.
const age = 20
const c = 'I am'
const d = 'years old.'
You might do this:
const combinedString = a + age + d
console.log(combinedString)
This will work. But it is not that readable. What if you can write all the substring, javascript expressions like variables, functions in a single string? That would be great. It would be readable and easy to do.
That's why we have Es6 template strings or template literals whatever you say.
Template literals are string literals allowing embedded expressions. You can use multi-line strings and string interpolation features with them.
The way you write is instead of a normal quotation mark you use backticks.
Inside backticks, you normally put javascript string.
const a = `My name is Anjan Shomodder`
If you want to use variables then you do this.
const a = 'My name is Anjan Shomodder.'
const b = 'I am a software engineer.'
const c = 'I am'
const d = 'years old.'
const age = 20
const combinedString = `${a}${b}${c}${age}${d} I always write good code. ha ha ha`
So instead of writing the variables directly. You add a dollar sign$ and then you wrap them with curly brackets.
output: My name is Anjan Shomodder. I am a software engineer.
You can put whatever expressions you like.
- add two number
const a = 21
const b = 10
const resultString = `${a} and ${b} adds up to ${a + b}`
- Ternary operator: Single line if statement.
console.log(`My name is ${3>2 : "Anjan" : "Mark" }`)
output: My name is Anjan
And you get the point.
You can also write multiline strings.
console.log(`string text line 1
string text line 2`)
Another big use case you will see is if you have experience with graphql. Graphql is a data query and manipulation language for back-end development.
- Example:
import {gql} from "apollo-server-express"
const schema = gql`
type Query {
findUser(id: String!): User!
}
type User {
name: String!
}
`
You can also see them on styled-components codes. Even though they are not template literals. They are tagged template literal.
const Button = styled.button`
background: transparent;
border-radius: 3px;
border: 2px solid palevioletred;
color: palevioletred;
margin: 0 1em;
padding: 0.25em 1em;
`
And that's all you need to know about template strings.
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Blogs you might want to read:
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This content originally appeared on DEV Community and was authored by Anjan Shomooder
Anjan Shomooder | Sciencx (2021-10-04T17:53:37+00:00) Everything you need to know about template strings. Retrieved from https://www.scien.cx/2021/10/04/everything-you-need-to-know-about-template-strings-2/
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