# Code and Focus
Code Hike will apply syntax highlighting to any code block
```js
function lorem(ipsum, dolor = 1) {
const sit = ipsum == null ? 0 : ipsum.sit;
dolor = sit - amet(dolor);
return sit ? consectetur(ipsum) : [];
}
```
It works by default with many languages
```groovy
def f() {
return [2, 3]
}
(a, b) = f()
println a
println b
```
Use `focus` to show the code that's important to the reader
```js focus=4
function lorem(ipsum, dolor = 1) {
const sit = ipsum == null ? 0 : ipsum.sit;
dolor = sit - amet(dolor);
return sit ? consectetur(ipsum) : [];
}
```
You can specify a list of line numbers
```js focus=1,3:4
function lorem(ipsum, dolor = 1) {
const sit = ipsum == null ? 0 : ipsum.sit;
dolor = sit - amet(dolor);
return sit ? consectetur(ipsum) : [];
}
```
And also columns
```js focus=2,4[10:13]
function lorem(ipsum, dolor = 1) {
const sit = ipsum == null ? 0 : ipsum.sit;
dolor = sit - amet(dolor);
return sit ? consectetur(ipsum) : [];
}
```