# List.Generate

## Syntax

List.Generate(initialas function,conditionas function,nextas function, optionalselectoras nullable function) as list

## About

Generates a list of values given four functions that generate the initial value `initial`

, test against a condition `condition`

, and if successful select the result and generate the next value `next`

. An optional parameter, `selector`

, may also be specified.

## Example 1

Create a list that starts at 10, remains greater than 0 and decrements by 1.

```
List.Generate(()=>10, each _ > 0, each _ - 1)
```

10 |

9 |

8 |

7 |

6 |

5 |

4 |

3 |

2 |

1 |

## Example 2

Generate a list of records containing x and y, where x is a value and y is a list. x should remain less than 10 and represent the number of items in the list y. After the list is generated, return only the x values.

```
List.Generate(()=> [ x = 1 , y = {}] , each [x] < 10 , each [x = List.Count([y]), y = [y] & {x}] , each [x])
```

1 |

0 |

1 |

2 |

3 |

4 |

5 |

6 |

7 |

8 |

9 |