feat(relation): add number comparison functions

src/_gt.scss

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+///
+/// Returns `true` if the first argument is greater than the second;
+/// `false` otherwise.
+///
+/// @group relation
+/// @param {Number} a
+/// @param {Number} b
+/// @return {Boolean}
+/// @see lt
+///
+/// @example scss - gt
+///
+///   gt(2, 1); //=> true
+///   gt(2, 2); //=> false
+///   gt(2, 3); //=> false
+///
+
+@function gt($a, $b) {
+    @return $a > $b;
+}

src/_gte.scss

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+///
+/// Returns `true` if the first argument is greater than or equal to the second;
+/// `false` otherwise.
+///
+/// @group relation
+/// @param {Number} a
+/// @param {Number} b
+/// @return {Boolean}
+/// @see lte
+///
+/// @example scss - gte
+///
+///   gte(2, 1); //=> true
+///   gte(2, 2); //=> true
+///   gte(2, 3); //=> false
+///
+
+@function gte($a, $b) {
+    @return $a >= $b;
+}

src/_lt.scss

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+///
+/// Returns `true` if the first argument is less than the second;
+/// `false` otherwise.
+///
+/// @group relation
+/// @param {Number} a
+/// @param {Number} b
+/// @return {Boolean}
+/// @see gt
+///
+/// @example scss - lt
+///
+///   lte(2, 1); //=> false
+///   lte(2, 2); //=> false
+///   lte(2, 3); //=> true
+///
+
+@function lt($a, $b) {
+    @return $a < $b;
+}

src/_lte.scss

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+///
+/// Returns `true` if the first argument is less than or equal to the second;
+/// `false` otherwise.
+///
+/// @group relation
+/// @param {Number} a
+/// @param {Number} b
+/// @return {Boolean}
+/// @see gte
+///
+/// @example scss - lte
+///
+///   lte(2, 1); //=> false
+///   lte(2, 2); //=> true
+///   lte(2, 3); //=> true
+///
+
+@function lte($a, $b) {
+    @return $a <= $b;
+}

test/_gt.spec.scss

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+@import 'true';
+@import '../src/gt';
+
+@include describe('gt [function]') {
+    @include it('reports whether one number is greater than another') {
+        @include assert-equal(gt(3, 5), false);
+        @include assert-equal(gt(6, 4), true);
+        @include assert-equal(gt(7, 7), false);
+    }
+}

test/_gte.spec.scss

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+@import 'true';
+@import '../src/gte';
+
+@include describe('gte [function]') {
+    @include it(
+        'reports whether one number is greater than or equal to another'
+    ) {
+        @include assert-equal(gte(3, 5), false);
+        @include assert-equal(gte(6, 4), true);
+        @include assert-equal(gte(7, 7), true);
+    }
+}

test/_lt.spec.scss

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+@import 'true';
+@import '../src/lt';
+
+@include describe('lt [function]') {
+    @include it('reports whether one number is less than another') {
+        @include assert-equal(lt(3, 5), true);
+        @include assert-equal(lt(6, 4), false);
+        @include assert-equal(lt(7, 7), false);
+    }
+}

test/_lte.spec.scss

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+@import 'true';
+@import '../src/lte';
+
+@include describe('lte [function]') {
+    @include it(
+        'reports whether one number is greater than or equal to another'
+    ) {
+        @include assert-equal(lte(3, 5), true);
+        @include assert-equal(lte(6, 4), false);
+        @include assert-equal(lte(7, 7), true);
+    }
+}