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I have a slice: Keys []* datastore.Key
How could I index one of them in the template file? I guessed {{.Keys[3] }}, but that doesn't work and I searched a lot but with no clue.
Any suggestions would be welcome, thanks.
706
Python also allows you to index from the end of the list using a negative number, where [-1] returns the last element. This is super-useful since it means you don't have to programmatically find out the length of the iterable in order to work with elements at the end of it.
Slicing is indexing syntax that extracts a portion from a list. If a is a list, then a[m:n] returns the portion of a : Starting with postion m. Up to but not including n. Negative indexing can also be used.
To extract elements with specific indices from a Python list, use slicing list[start:stop:step] . If you cannot use slicing because there's no pattern in the indices you want to access, use the list comprehension statement [lst[i] for i in indices] , assuming your indices are stored in the variable indices .
Consider a python list, In-order to access a range of elements in a list, you need to slice a list. One way to do this is to use the simple slicing operator i.e. colon(:) With this operator, one can specify where to start the slicing, where to end, and specify the step.
Use the index command like so:
{{index .Keys 3}} As stated in the html/template package, the majority of examples are actually located in the text/template pkg docs. See http://golang.org/pkg/text/template/
From the docs
index Returns the result of indexing its first argument by the following arguments. Thus "index x 1 2 3" is, in Go syntax, x[1][2][3]. Each indexed item must be a map, slice, or array. If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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