Here’s how you can iterate over a list of items, accessing each item’s attributes:
1 function MyFunc(messages: Message[]) -> string { 2 prompt #" 3 {% for message in messages %} 4 {{ message.user_name }}: {{ message.content }} 5 {% endfor %} 6 "# 7 }
Jinja provides a loop object that can be used to access information about the loop. Here are some of the attributes of the loop object:
| Variable | Description |
|---|---|
| loop.index | The current iteration of the loop. (1 indexed) |
| loop.index0 | The current iteration of the loop. (0 indexed) |
| loop.revindex | The number of iterations from the end of the loop (1 indexed) |
| loop.revindex0 | The number of iterations from the end of the loop (0 indexed) |
| loop.first | True if first iteration. |
| loop.last | True if last iteration. |
| loop.length | The number of items in the sequence. |
| loop.cycle | A helper function to cycle between a list of sequences. See the explanation below. |
| loop.depth | Indicates how deep in a recursive loop the rendering currently is. Starts at level 1 |
| loop.depth0 | Indicates how deep in a recursive loop the rendering currently is. Starts at level 0 |
| loop.previtem | The item from the previous iteration of the loop. Undefined during the first iteration. |
| loop.nextitem | The item from the following iteration of the loop. Undefined during the last iteration. |
| loop.changed(*val) | True if previously called with a different value (or not called at all). |
1 prompt #" 2 {% for item in items %} 3 {{ loop.index }}: {{ item }} 4 {% endfor %} 5 "#