Constructor
new Maybe(val)
Maybe monad provides a way to safely wrap null values
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Parameters:
| Name | Type | Description |
|---|---|---|
val |
*
|
Value to be wrapped |
Example
const m = Maybe.of(props.customers).map(contract => customer[0]).getOrElse('No customer found')Members
type :String
Properties:
| Name | Type | Description |
|---|---|---|
type |
String
|
Returns the string 'Maybe' for all Maybe objects |
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Type:
-
String
Example
const m = Maybe.of([[1,2],[2,3],[4,5]])
m.type === 'Maybe'Methods
(static) of(val) → {Maybe}
Creates a Maybe monad from the provided argument
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Parameters:
| Name | Type | Description |
|---|---|---|
val |
*
|
Val to turn in to a Maybe monad, can be a function |
Returns:
- Type:
-
Maybe
Example
const m = Maybe.of(props.customers).map(customer => customer[0]).getOrElse('No customer found')getOrElse(n) → {*}
Evaluates the Maybe monad and returns either the value from the Maybe or the default value
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Parameters:
| Name | Type | Description |
|---|---|---|
n |
*
|
Default value to return if the Maybe evaluates to undefined or null |
Returns:
- Type:
-
*
Example
// Get customer from component props
const m = Maybe.of(props.customers).map(customer => customer.filter(custObj => custObj.id = 'c001112')).getOrElse([])
// Map over the provided array
m.map(x => <div>Customer ID: {x.id} </div>)