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query values to see if they are truthy, in the JavaScript sense #318

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query values to see if they are truthy, in the JavaScript sense #318

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17 changes: 17 additions & 0 deletions gjson.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
package gjson

import (
"math"
"strconv"
"strings"
"time"
Expand Down Expand Up @@ -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.
Expand Down
38 changes: 38 additions & 0 deletions gjson_test.go
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Expand Up @@ -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)
}