This question already has answers here:
Template literals like 'some ${string}' or "some ${string}" are not working
(7 answers)
Closed 3 years ago.
Template Strings should work on any terminals such as visual studio code terminal or windows terminal. But it didn't. I did this code visual studio code. Here is My code
var name = 'Andrew';
console.log('Hello ${name}');
and the output is
Hello ${name}
Please specify changes in my code needed and explain why it doesn't work currently.
Single and double quotes wont invoke the behavior - use back ticks.
var name = 'Andrew';
console.log(`Hello ${name}`);
// ^ ^
More information on Template literals,
All that is inside a string, is literal. You're writing the variable ${name} inside the normal quotes, so it will be printed literal.
If you want to have it interpretated, you have to concatenate the answer, as for example:
console.log('Hello ' + name)
The quotes to use a template are not the ones you are using, these are the correct ones: (closed accents / back-tick )
`Hello ${name}`
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals
var name = 'Andrew';
console.log(`Hello ${name}`);
Template literals are string literals allowing embedded expressions. You can use multi-line strings and string interpolation features with them. They were called "template strings" in prior editions of the ES2015 specification.
Template literals are enclosed by the back-tick (``) (grave accent) character instead of double or single or double quotes.
It's not a quote, nor double quote
var name = 'Andrew'
console.log(`Hello ${name}`)
Here is a tutorial about it: https://babeljs.io/learn-es2015/#template-strings
Related
I'm writing React JS code for webpage.
The tutorial says the const value can be used inside the string with ${ } expression.
However, when I try it in my IDLE, it just recognize them as same string not const value.
What should I do to call saved const value inside the string
This is what it is supposed to be:
This is what I get instead:
async function getHeadlines(search) {
const url = 'https://newsapi.org/v2/top-headlines?country=au&apiKey={API_KEY}&q=${search}';
let res = await fetch(url);
let data = await res.json();
let articles = data.articles;
return articles.map((article) => ({
title: article.title,
url: article.url,
}));
}
You need to use backtick. Please go throught Template literals to understand how backtick works.
const url = `https://newsapi.org/v2/top-headlines?country=au&apiKey=${API_KEY}&q=${search}`;
As far as I can understand your question, you have to use template strings (check docs for more) for this URL:
const url = https://newsapi.org/v2/top-headlines?country=au&apiKey={API_KEY}&q=${search};
Now you can add API_KEY and search into a string.
Like everyone else said, you need to use backticks for template literals.
It looks like you are confusing non-template literal strings with template literals and their syntax (you forgot a $ in one of the literal block declarations). Let's have a little review, shall we?
Non-template literal strings look like this:
"This is a string with double quotes. It does not parse literals (${})";
'This is a string with single quotes. It does not parse literals (${})';
They use either single quotes (') or double quotes (").
Template literals are a special type of string, they allow insertion of variables and/or other data without having to use string concatenation ("This string " + "just got concatenated"). To do so, you have to wrap your code you want outputted in a ${} block, like this:
const textToInsert = "Hello, world!";
`This is a template literal. It is a string that allows easier concatenation without using the "+" operator. This parses literals, see? "${textToInsert}"`
Since the code is "executed", you can also use ternary operators:
`A random number I am thinking of is ${Math.floor(Math.random() * 10) >= 5 ? "greater than or equal to five" : "less than five"}`
Template literals are also useful if you use double quotes or single quotes in your string. If you use a single quote to declare a string that uses single quotes, you would have to escape them:
'It\'s a wonderful life'
The same applies to double quote strings using double quotes:
"\"I have no special talent. I am only passionately curious\" - Albert Einstein"
But, if you use template literals, you can use both single and double quotes without escaping them (note that you will have to escape backticks (`)):
`
It's a wonderful life.
"I have no special talent. I am only passionately curious" - Albert Einstein
`
Oh, I forgot to mention - template literals support newlines!!!
The conclusion? Template literals are powerful! You just have to know how to use them :)
So, what would your fixed template literal look like?
It would look like this:
`https://newsapi.org/v2/top-headlines?country=au&apiKey=${API_KEY}&q=${search}`;
This question already has answers here:
Are double and single quotes interchangeable in JavaScript?
(23 answers)
Closed 3 years ago.
I've been learning JavaScript for not too long, and somethings that I notice a lot, but doesn't make sense to me are the different operators (if I can call them that) that defines a string. What I mean by that is the single quote ('), the double quote (") and the apostrophe-thing(`). I have come to realize that ``` is used when you want to use the variable or something (eg
console.log(`this is my string ${ str }`)
or something like that. I don't know too much about these and I would like to know what their different purposes are (or in the very least, what they are called)
Thanks!
P.S. I realize that this question topic causes some problems with the markdown. I have no idea how to fix it.
The apostrophe thing ` is general used for multi line strings while single and double quotes are used for single line strings. Single quotes are used to enclose double quotes.
For example: say I have a string like so: "I ate a fruit". If I want to print that string with the quotation marks I would use console.print(' "I ate a fruit" ').
I saw this code:
secondHand.style.transform = rotate(${secondsDegrees}deg);
I am struggling with the symbol that is wrapped around the code `rotate(${secondsDegrees}deg)`. I have not seen a ` used in javascript code before. The key is known as the acute, back quote, grave, grave accent, left quote, open quote, or the push key.
Any explanations would be appreciated!
`` Those are called backticks, and they create a template literal for easier insertion of variable values into strings, in JavaScript.
Example:
const someName = 'Jack'
const someTemplateLiteral = `${someName} and Jill went up a hill`
console.log(someTemplateLiteral)
// logs: 'Jack and Jill went up a hill'
This is a common string quote used in ES6 known as template literals.
Some commond examples:
`string text`
`string text line 1
string text line 2`
`string text ${expression} string text`
Template literals are string literals allowing embedded expressions.
You can use multi-line strings and string interpolation features with
them. They were called "template strings" in prior editions of the
ES2015 specification.
Check here - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals
This question already has answers here:
Usage of the backtick character (`) in JavaScript
(11 answers)
Closed 6 years ago.
Recently ran into some JS code that uses ` and '. I can't figure out if there is a different use for each apostrophe. Is there any?
' or " denotes a string
` denotes a template string. Template strings have some abilities that normal strings do not. Most importantly, you get interpolation:
var value = 123;
console.log('test ${value}') //=> test ${value}
console.log(`test ${value}`) //=> test 123
And multiline strings:
console.log('test
test')
// Syntax error
console.log(`test
test`)
// test
// test
They have some other tricks too, more on template strings here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/template_strings
Note they are not supported in all javascript engines at the moment. Which is why template strings are often used with a transpiler like Babel. which converts the code to something that will work in any JS interpreter.
This question already has answers here:
Does JavaScript have literal strings?
(6 answers)
Closed 7 years ago.
In Ruby, if you use single quotes to make a string, the program parses it so that the output is literally what you wrote.
For example, if you create a string the following way:
variable_a = 'my\nname\nis\nOliver\nQueen'
the output of puts variable_a is
>>my\nname\nis\nOliver\nQueen
However, if you instead use double quotes when building the string, like so:
variable_b = "my\nname\nis\nOliver\nQueen"
the output of puts variable_b would be
>>my
>>name
>>is
>>Oliver
>>Queen
I am looking for a way in Javascript that does just what the single quotes do in Ruby, so that there will be less mistakes when trying to properly build a string that contains backslashes, and other characters that would 'break' the intended string.
Single and double quotes in Javascript are equivalent. The only real reason to use one over the other is preference, and avoiding escaping embedded quotes, e.g.
"Don't need to escape this apostrophe."
or
'No need to escape this "quoted" word.'
Unless you are talking about JSON. In JSON you must use double quotes or it is considered a syntax error by many parsers.