{{$csv := 
`lang,keywords
C,32
Go,25
COBOL,357` -}}

{{- $c := ($csv | data.CSVByRow)}}
$c: {{$c}}

{{- $d := coll.Slice (coll.Dict "lang" "C" "keywords" "32") (coll.Dict "lang" "Go" "keywords" "25") (coll.Dict "lang" "COBOL" "keywords" "357")}}
$d: {{$d}}

{{$testTemplate := `{{range . -}}
{{.lang }} has {{ .keywords }} keywords.
[{{.missingKey}}] does not exist.
{{if .missingKey}}bad{{else}}good{{end}}
{{if .missingKey | strings.TrimSpace}}bad{{else}}good{{end}}
{{if $x := .missingKey | strings.TrimSpace}}bad{{else}}good{{end}}
{{end}}` -}}

Render $c:
{{tmpl.Inline $testTemplate $c}}
Render $d:
{{tmpl.Inline $testTemplate $d}}

$c: [map[keywords:32 lang:C] map[keywords:25 lang:Go] map[keywords:357 lang:COBOL]]
$d: [map[keywords:32 lang:C] map[keywords:25 lang:Go] map[keywords:357 lang:COBOL]]

Render $c:
C has 32 keywords.
[] does not exist.
good
good
good
Go has 25 keywords.
[] does not exist.
good
good
good
COBOL has 357 keywords.
[] does not exist.
good
good
good

Render $d:
C has 32 keywords.
[<no value>] does not exist.
good
bad
bad
Go has 25 keywords.
[<no value>] does not exist.
good
bad
bad
COBOL has 357 keywords.
[<no value>] does not exist.
good
bad
bad