Value from map

Supported in: Batch, Streaming

Get a value from a map using a key.

Expression categories: Map

Declared arguments

• Key - Key expression.
  Expression<K>
• Map - Map expression.
  Expression<Map<K, V>>

Type variable bounds: K accepts ComparableType**V accepts AnyType

Output type: V

Examples

Example 1: Base case

Argument values:

• Key: [ 1 ]
• Map: {
   [ 1 ] -> Foo,
  }

Output: Foo

---

Example 2: Base case

Argument values:

• Key: Bar
• Map: {
   Bar -> 2,
   Foo -> 1,
  }

Output: 2

---

Example 3: Base case

Argument values:

• Key: 1
• Map: {
   1 -> 10,
   2 -> 20,
  }

Output: 10

---

Example 4: Base case

Argument values:

• Key: Foo
• Map: {
   Bar -> World,
   Foo -> Hello,
  }

Output: Hello

---

Example 5: Base case

Argument values:

• Key: Foo
• Map: {
   Bar -> World,
  }

Output: null

---

Example 6: Base case

Argument values:

• Key: [ [ 1 ], [ 1 ] ]
• Map: {
   [ [ 1 ], [ 1 ] ] -> Foo,
  }

Output: Foo

---

Example 7: Null case

Argument values:

• Key: key
• Map: map

---