Function singleFromArray

For a stream that emits arrays of values, this op will select a single value.

Can select based on:

• predicate: a function that returns true for a value
• at: selection based on array index (can be combined with random ordering to select a random value)

// If source is Reactive<Array<number>>, picks the first even number
singleFromArray(source, { 
 predicate: v => v % 2 === 0
});

// Selects a random value from source
singleFromArray(source, { 
 order: `random`,
 at: 0
});
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If neither predicate or at options are given, exception is thrown.