---

title: "Codebraid with JavaScript"

---

## Inline code

### Run

Inline code with `.cb-run` gives raw stdout. While the language can be

specified with `.javascript`, `.js` works as well.

`console.log(1 + 2);`{.js .cb-run example=true}

### Expression and inline notebook

Inline code with `.cb-expr` evaluates an expression and then inserts the raw

output into the document, where it is interpreted as Markdown. Inline code

with `.cb-nb` (`nb` is short for `notebook`) is similar, except output is

shown verbatim.

`` `\$2^8 = ${2**8}\$` ``{.js .cb-expr example=true}

`4*16`{.js .cb-nb example=true}

### Stderr

In the event of an error, inline code automatically shows stderr by default.

This code is executed in its own session, `inline_error`, so that it does

not impact other examples.

`console.logs(1 + 2);`{.js .cb-run session=inline_error example=true}

## Block code

### Run

Code blocks with `.cb-run` give raw stdout. There is continuity between code

blocks so long as they are in the same session; variables persist.

```{.js .cb-run example=true}

message = "Hello from *JavaScript!*";

```

```{.js .cb-run example=true}

console.log(message);

```

### Notebook

Code blocks with `.cb-nb` show the code and also the verbatim stdout.

```{.js .cb-nb session=notebook example=true}

function pows_of_two(start, end) {

n = 2;

x = start;

while (x < end) {

process.stdout.write(String(2**x) + ", ");

x += 1;

}

console.log(2**end);

}

pows_of_two(1, 9);

pows_of_two(1, 15);

```

### Stderr

Code blocks show stderr automatically by default.

```{.js .cb-nb session=block_error example=true}

x = 1 + ;

```