asNumeric

src/Type.php

@@ -35,6 +35,18 @@ public function asString(): string
         return $this->variable;
     }
 
+    /**
+     * Asserts and narrow down the type to numeric.
+     */
+    public function asNumeric(): int|float|string
+    {
+        if (! is_numeric($this->variable)) {
+            throw new TypeError('Variable is not a numeric.');
+        }
+
+        return $this->variable;
+    }
+
     /**
      * Asserts and narrow down the type to integer.
      */

tests/AsNumericTest.php

@@ -0,0 +1,24 @@
+<?php
+
+test('numeric type', function ($variable) {
+    $value = type($variable)->asNumeric();
+
+    expect($value)->toBeNumeric();
+})->with([
+    7415541,
+    7415.541,
+    "7415541",
+    0b01100110,
+    0x66,
+]);
+
+test('not numeric type', function () {
+    $variable = 'string';
+
+    type($variable)->asNumeric();
+})->with([
+    "",
+    "not numeric",
+    null,
+    []
+])->throws(TypeError::class, 'Variable is not a numeric.');