feat: implement eq and ne

src/logic.js

@@ -0,0 +1,57 @@
+/**
+ * @license MIT
+ * @copyright (c) 2021 Julien Gonzalez <hello@spinjs.com>
+ */
+
+const {curry} = require('./functions');
+
+/**
+ * @namespace
+ * @alias ROOT
+ */
+module.exports = {
+  /**
+   * True if `a` and `b` are equal. Use `Object.is`.
+   *
+   * @example
+   * ```javascript
+   * const eq42 = eq(42);
+   *
+   * eq42(42);
+   * //=> true
+   *
+   * eq42('42');
+   * //=> false
+   *
+   * eq(NaN, NaN);
+   * //=> true;
+   * ```
+   *
+   * @public
+   * @param {?} a
+   * @param {?} b
+   * @return {boolean}
+   * @see ne
+   */
+  eq: curry((a, b) => Object.is(a, b) == true),
+
+  /**
+   * True if `a` and `b` are not equal. Use `Object.is`.
+   *
+   * @example
+   * ```javascript
+   * ne(null, undefined);
+   * //=> true
+   *
+   * ne(NaN, NaN);
+   * //=> false
+   * ```
+   *
+   * @public
+   * @param {?} a
+   * @param {?} b
+   * @return {boolean}
+   * @see eq
+   */
+  ne: curry((a, b) => Object.is(a, b) == false)
+};

test/logic.test.js

@@ -0,0 +1,22 @@
+const test = require('tape');
+const {eq, ne} = require('../');
+
+test('eq returns true if both parameters are equal', t => {
+  const run = (a, b) => t.same(eq(a)(b), Object.is(a, b));
+  run(1, '1');
+  run(0, false);
+  run(+0, -0);
+  run(NaN, NaN);
+  run(null, undefined);
+  t.end();
+});
+
+test('ne returns true if both parameters are not equal', t => {
+  const run = (a, b) => t.same(ne(a)(b), Object.is(a, b) == false);
+  run(1, '1');
+  run(0, false);
+  run(+0, -0);
+  run(NaN, NaN);
+  run(null, undefined);
+  t.end();
+});