= Bloblang Methods
// tag::single-source[]
:description: A list of Bloblang methods

// © 2024 Redpanda Data Inc.


Methods provide most of the power in Bloblang as they allow you to augment values and can be added to any expression (including other methods):

```bloblang
root.doc.id = this.thing.id.string().catch(uuid_v4())
root.doc.reduced_nums = this.thing.nums.map_each(num -> if num < 10 {
  deleted()
} else {
  num - 10
})
root.has_good_taste = ["pikachu","mewtwo","magmar"].contains(this.user.fav_pokemon)

# In:  {"thing":{"id":123,"nums":[5,12,18,7,25]},"user":{"fav_pokemon":"pikachu"}}
```

Methods support both named and nameless style arguments:

```bloblang
root.foo_one = this.(bar | baz).trim().replace_all(old: "dog", new: "cat")
root.foo_two = this.(bar | baz).trim().replace_all("dog", "cat")

# In:  {"bar":"  I love my dog  "}
```
{{#each categories}}

== {{{toSentenceCase this.name}}}
{{#each this.methods}}

include::connect:components:partial$bloblang-methods/{{this}}.adoc[leveloffset=+2]
{{/each}}
{{/each}}

// end::single-source[]