CODEWITHSUNDEEP
javascripttemplate-literals
user9945420
user9945420

Reputation:

Howto ignore specific string interpolation and use plain text in JavaScript template literals?

I have to setup a config file by code and pass in some variables

const confEntry = String.raw`
[${internal}]
...
user = bg${internal}
auth_user = bg${internal}
...
secret = ${password}
...
from_sip_src_setting=from_display,sip_from_user_setting=${account_username}
...
`;

when it comes to

from_sip_src_setting=from_display,sip_from_user_setting=${account_username}

I don't want to pass in a variable. =${account_username} should be written as plain text. Obviously I get the error

account_username is not defined

How can I ignore this and write plain text for this specific part?

Upvotes: 2

Views: 2131

Answers (3)

jo_va
jo_va

Reputation: 13963

If you want to keep ${} in your final string, you can escape either the dollar sign, the curly braces or both using a backslash \, this will break the ${} pattern and it will be treated as regular text:

const world = 'world';
console.log(`\${hello} $\{world\} \$\{hello\} ${world}`);

However, since String.raw escapes everything, you cannot use that trick.

But, using the above trick, you could generate the ${str} string using an inner template string like this:

const world = 'world';
const raw = x => `\${${x}}`;
console.log(String.raw`${raw('hello')} ${world}`);

Or simply:

const world = 'world';
const raw = x => '${' + x + '}';
console.log(String.raw`${raw('hello')} ${world}`);

Upvotes: 2

Code Maniac
Code Maniac

Reputation: 37755

String.raw used to get the raw string form of template strings, that is, substitutions (e.g. ${foo}) are processed, but escapes (e.g. \n) are not.

String.raw do not process your escapes.

let a = String.raw`hello\nhow are you`
let b = `hello\nhow are you`

console.log(a) //raw string output
console.log(b) // template string output

Upvotes: 0

Clyde Lobo
Clyde Lobo

Reputation: 9174

You will need to escape the curly braces in order for it not to be interpreted as a string literal

So instead of ${account_username} ist would be $\{account_username\}

Upvotes: 1

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