feat: implement div as an operator function

Author: customcommander

src/div.js

@@ -0,0 +1,23 @@
+/**
+* @license MIT
+* @copyright (c) 2022 Julien Gonzalez <hello@spinjs.com>
+*/
+
+const op = require('./_operator');
+
+/**
+ * @summary
+ * Functional equivalent of `a / b`.
+ *
+ * @example
+ * map(div(4))([20,40,60,80])
+ * //=> [5,10,15,20]
+ *
+ * @operator
+ * @function
+ * @param {number} a
+ * @param {number} b
+ * @return {number}
+ * @see __
+ */
+module.exports = op((a, b) => a / b);

test/div.test.js

@@ -0,0 +1,17 @@
+const testcheck = require('./_check');
+const {div: sut, __} = require('..');
+
+const verif = (res, a, b) =>
+  Object.is(res, a / b);
+
+testcheck('div(a, b)',
+  ['number', 'number'], (a, b) =>
+    verif(sut(a, b), a, b));
+
+testcheck('div(b)(a)',
+  ['number', 'number'], (a, b) =>
+    verif(sut(b)(a), a, b));
+
+testcheck('div(a, __)(b)',
+  ['number', 'number'], (a, b) =>
+    verif(sut(a, __)(b), a, b));