Add: Valid Number

Author: openset

problems/valid-number/valid_number.go

@@ -1 +1,12 @@
-package valid_number
+package problem_65
+
+import (
+	"strconv"
+	"strings"
+)
+
+func isNumber(s string) bool {
+	s = strings.TrimSpace(s)
+	_, err := strconv.ParseFloat(s, 64)
+	return err == nil || err.(*strconv.NumError).Err != strconv.ErrSyntax
+}

problems/valid-number/valid_number_test.go

@@ -1 +1,79 @@
-package valid_number
+package problem_65
+
+import "testing"
+
+type caseType struct {
+	input    string
+	expected bool
+}
+
+func TestIsNumber(t *testing.T) {
+	tests := [...]caseType{
+		{
+			input:    "0",
+			expected: true,
+		},
+		{
+			input:    " 0.1",
+			expected: true,
+		},
+		{
+			input:    "abc",
+			expected: false,
+		},
+		{
+			input:    "1 a",
+			expected: false,
+		},
+		{
+			input:    "2e10",
+			expected: true,
+		},
+		{
+			input:    " -90e3   ",
+			expected: true,
+		},
+		{
+			input:    " 1e",
+			expected: false,
+		},
+		{
+			input:    "e3",
+			expected: false,
+		},
+		{
+			input:    " 6e-1",
+			expected: true,
+		},
+		{
+			input:    " 99e2.5 ",
+			expected: false,
+		},
+		{
+			input:    "53.5e93",
+			expected: true,
+		},
+		{
+			input:    " --6 ",
+			expected: false,
+		},
+		{
+			input:    "-+3",
+			expected: false,
+		},
+		{
+			input:    "95a54e53",
+			expected: false,
+		},
+		{
+			input:    "078332e437",
+			expected: true,
+		},
+	}
+	for _, tc := range tests {
+		output := isNumber(tc.input)
+		if output != tc.expected {
+			t.Fatalf("input: %v, output: %v, expected: %v", tc.input, output, tc.expected)
+		}
+	}
+}