Add some utility functions

pkg/types/basic.go

@@ -11,6 +11,15 @@ func B(v bool) BoolType {
 	return BoolType(&v)
 }
 
+// BA converts a list of bool into BooleanType
+func BA(v []bool) []BoolType {
+	result := make([]BoolType, len(v))
+	for i := range v {
+		result[i] = B(v[i])
+	}
+	return result
+}
+
 var (
 	trueValue  bool = true
 	falseValue bool = false
@@ -38,6 +47,15 @@ func N(n float64) NumberType {
 	return NumberType(&n)
 }
 
+// NA converts a list of float64 to NumberType
+func NA(n []float64) []NumberType {
+	result := make([]NumberType, len(n))
+	for i := range n {
+		result[i] = N(n[i])
+	}
+	return result
+}
+
 // NS Given a string, parses it as a float64 number
 // Panics if the string is not a float number
 func NS(n string) NumberType {
@@ -55,6 +73,15 @@ func I(n int) IntegerType {
 	return IntegerType(&n)
 }
 
+// IA converts a list of int to IntegerType
+func IA(n []int) []IntegerType {
+	result := make([]IntegerType, len(n))
+	for i := range n {
+		result[i] = I(n[i])
+	}
+	return result
+}
+
 // IS Given a string, parses it as an integer number
 // Panics if the string is not an integer number
 func IS(n string) IntegerType {

pkg/types/color.go

@@ -8,6 +8,18 @@ import (
 // Color A string describing color. Supported formats: - hex (e.g. '#d3d3d3') - rgb (e.g. 'rgb(255, 0, 0)') - rgba (e.g. 'rgb(255, 0, 0, 0.5)') - hsl (e.g. 'hsl(0, 100%, 50%)') - hsv (e.g. 'hsv(0, 100%, 100%)') - named colors (full list: http://www.w3.org/TR/css3-color/#svg-color)",
 type Color string
 
+func C(v string) Color {
+	return Color(v)
+}
+
+func CN(v []string) []Color {
+	result := make([]Color, len(v))
+	for i := range v {
+		result[i] = C(v[i])
+	}
+	return result
+}
+
 func UseColorScaleValues(in []float64) []ColorWithColorScale {
 	out := make([]ColorWithColorScale, len(in), len(in))
 	for i := 0; i < len(in); i++ {