+++
title = "2l: Container from Container"
weight = 15
template = "doc.html"
+++

## `++malt`

Map from list

Produces a map from a list `a`.

#### Accepts

`a` is a list.

#### Produces

A map.

#### Source

```hoon
++  malt                                                ::  map from list
  |*  a=(list)
  (molt `(list [p=_-<.a q=_->.a])`a)
```

#### Examples

```
    > (malt [['ok' 'no'] ['a' 'b'] ['x' 'y'] ~])
    [n=[p='x' q='y'] l={[p='a' q='b'] [p='ok' q='no']} r={}]

    > (malt ~[[1 2 3] [4 5 6] [7 8 9]])
    [n=[p=1 q=[2 3]] l={[p=4 q=[5 6]] [p=7 q=[8 9]]} r={}]
```

---

## `++molt`

Map from pair list

Produces a map from a list of pairs `a`.

#### Accepts

`a` is a list of pairs.

#### Produces

A map.

#### Source

```hoon
    ++  molt
      |*  a=(list (pair))
      (~(gas by `(tree [p=_p.i.-.a q=_q.i.-.a})`~) a)
```

#### Examples

```
    > =a `(list (pair))`[[1 2] [4 3] [11 0] ~]
    > a
    > ~[[p=1 q=2] [p=4 q=3] [p=11 q=0]]

    > (molt a)
    [n=[p=11 q=0] l={[p=4 q=3] [p=1 q=2]} r={}]
```

#### Discussion

Only used internally as a helper to `malt`.

---

## `++silt`

Set from list

Produces a set from a list `a`.

#### Accepts

`a` is a list.

#### Produces

A set.

#### Source

```hoon
    ++  silt
      |*  a=(list)
      =+  b=*(tree _?>(?=(^ a) i.a))
      (~(gas in b) a)
```

#### Examples

```
    > (silt `(list @t)`['c' 'hoon' 'javascript' 'python' ~])
    [n='javascript' l={} r={'python' 'hoon' 'c'}]
```

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