Function computeIfAbsent

computeIfAbsent<K, V>(map: Map<K, V>): ((key: K, mappingFunction: Mapper<K, V>) => undefined | V)
Mutation

Remark
only returns undefined if mappingFunction returns undefined

Example
Set a Map entry if the key is absent
```
const map = new Map();
computeIfAbsent(map)(1, key => key + 1);
console.log(map); // Map([[1, 2]])
```
Type Parameters
- K
  
  the Map key type
- V
  
  the Map value type
Parameters
- map: Map<K, V>
  
  the Map to set the entry
Returns ((key: K, mappingFunction: Mapper<K, V>) => undefined | V)
- - (key: K, mappingFunction: Mapper<K, V>): undefined | V
  - Parameters
    - key: K
    - mappingFunction: Mapper<K, V>
    Returns undefined | V
- Defined in packages/map/src/computeIfAbsent.ts:23

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