query values to see if they are truthy, in the JavaScript sense

gjson.go

@@ -2,6 +2,7 @@
 package gjson
 
 import (
+	"math"
 	"strconv"
 	"strings"
 	"time"
@@ -187,6 +188,22 @@ func (t Result) Time() time.Time {
 	return res
 }
 
+// Truthy returns the truthiness of the value (all values are truthy except false, null, 0, -0, NaN, and "").
+func (t Result) Truthy() bool {
+	switch t.Type {
+	case Null, False:
+		return false
+	case Number:
+		return math.IsNaN(t.Num) == false && t.Num != 0
+	case String:
+		return t.Str != ""
+	case True, JSON:
+		return true
+	default:
+		return false
+	}
+}
+
 // Array returns back an array of values.
 // If the result represents a null value or is non-existent, then an empty
 // array will be returned.

gjson_test.go

@@ -2591,3 +2591,41 @@ func TestIssue301(t *testing.T) {
 	assert(t, Get(json, `fav\.movie.[1]`).String() == "[]")
 
 }
+
+func TestTruthy(t *testing.T) {
+	json := `{
+		"aye1": true,
+		"aye2": 1,
+		"aye3": -1,
+		"aye4": 0.001,
+		"aye5": "aye",
+		"aye6": {},
+		"aye7": [],
+		"aye8": +Inf,
+		"aye9": -Inf,
+
+		"nay1": false,
+		"nay2": null,
+		"nay3": 0,
+		"nay4": -0,
+		"nay5": "",
+		"nay6": NaN,
+	}`
+
+	assert(t, Get(json, "aye1").Truthy() == true)
+	assert(t, Get(json, "aye2").Truthy() == true)
+	assert(t, Get(json, "aye3").Truthy() == true)
+	assert(t, Get(json, "aye4").Truthy() == true)
+	assert(t, Get(json, "aye5").Truthy() == true)
+	assert(t, Get(json, "aye6").Truthy() == true)
+	assert(t, Get(json, "aye7").Truthy() == true)
+	assert(t, Get(json, "aye8").Truthy() == true)
+	assert(t, Get(json, "aye9").Truthy() == true)
+
+	assert(t, Get(json, "nay1").Truthy() == false)
+	assert(t, Get(json, "nay2").Truthy() == false)
+	assert(t, Get(json, "nay3").Truthy() == false)
+	assert(t, Get(json, "nay4").Truthy() == false)
+	assert(t, Get(json, "nay5").Truthy() == false)
+	assert(t, Get(json, "nay6").Truthy() == false)
+}