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Diffstat (limited to 'src/syscall/js/js.go')
| -rw-r--r-- | src/syscall/js/js.go | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/syscall/js/js.go b/src/syscall/js/js.go index dc741e79a7..19cdedc309 100644 --- a/src/syscall/js/js.go +++ b/src/syscall/js/js.go @@ -370,6 +370,26 @@ func (v Value) Bool() bool { } } +// Truthy returns the JavaScript "truthiness" of the value v. In JavaScript, +// false, 0, "", null, undefined, and NaN are "falsy", and everything else is +// "truthy". See https://developer.mozilla.org/en-US/docs/Glossary/Truthy. +func (v Value) Truthy() bool { + switch v.Type() { + case TypeUndefined, TypeNull: + return false + case TypeBoolean: + return v.Bool() + case TypeNumber: + return v.ref != valueNaN.ref && v.ref != valueZero.ref + case TypeString: + return v.String() != "" + case TypeSymbol, TypeFunction, TypeObject: + return true + default: + panic("bad type") + } +} + // String returns the value v converted to string according to JavaScript type conversions. func (v Value) String() string { str, length := valuePrepareString(v.ref) |