select

Filter and map an array
Usage

Applies a filter and a map operation at once and in one pass. If the filter is omitted, returns all non-nullish mapped values.
import * as 
import _
_ from 'radashi'

const 
const fish: {
    name: string;
    weight: number;
    source: string;
}[]
fish = [
  {
    
name: string
name: 'Marlin',
    
weight: number
weight: 105,
    
source: string
source: 'ocean',
  },
  {
    
name: string
name: 'Bass',
    
weight: number
weight: 8,
    
source: string
source: 'lake',
  },
  {
    
name: string
name: 'Trout',
    
weight: number
weight: 13,
    
source: string
source: 'lake',
  },
]

import _
_.
select<{
    name: string;
    weight: number;
    source: string;
}, number>(array: readonly {
    name: string;
    weight: number;
    source: string;
}[], mapper: (item: {
    name: string;
    weight: number;
    source: string;
}, index: number) => number, condition: ((item: {
    name: string;
    weight: number;
    source: string;
}, index: number) => boolean) | ... 1 more ... | undefined): number[] (+1 overload)
export select
Select performs a filter and a mapper inside of a reduce, only
iterating the list one time. If condition is omitted, will
select all mapped values that are non-nullish.
@see ― https://radashi.js.org/reference/array/select
@example 
select(
  [1, 2, 3, 4],
  x => x * x,
  x => x > 2
)
// => [9, 16]
@version ― 12.1.0
select(
  
const fish: {
    name: string;
    weight: number;
    source: string;
}[]
fish,
  
f: {
    name: string;
    weight: number;
    source: string;
}
f => 
f: {
    name: string;
    weight: number;
    source: string;
}
f.
weight: number
weight,
  
f: {
    name: string;
    weight: number;
    source: string;
}
f => 
f: {
    name: string;
    weight: number;
    source: string;
}
f.
source: string
source === 'lake',
) // => [8, 13]