feat(lib): add ending test

js-republic · Nov 25, 2017 · d8c5de3 · d8c5de3
1 parent e3fd695
commit d8c5de3
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Showing 2 changed files with 36 additions and 0 deletions.
diff --git a/lib/lib.test.ts b/lib/lib.test.ts
@@ -6,6 +6,7 @@ import {
   intersect,
   isAfter,
   isBefore,
+  isEnding,
   isMeeting,
   isOverlapping,
   isStarting,
@@ -66,6 +67,21 @@ const testFnToIntervals = (
   t.throws(fn.bind(null, [{ test: 1 }], { test: 1 }), 'Unrecognized interval format');
 };
 
+test('will find ending', t => {
+  const i1 = { start: 1, end: 8 };
+  const i2 = { start: 0, end: 8 };
+  const testOutputFn = t.true.bind(t);
+  testFnToBoolean(i1, i2, isEnding, testOutputFn);
+  testFnToBoolean(i2, i1, isEnding, testOutputFn);
+});
+
+test('will not find ending', t => {
+  const i1 = { start: 0, end: 5 };
+  const i2 = { start: 0, end: 8 };
+  const testOutputFn = t.false.bind(t);
+  testFnToBoolean(i1, i2, isEnding, testOutputFn);
+});
+
 test('will find starting', t => {
   const i1 = { start: 0, end: 5 };
   const i2 = { start: 0, end: 8 };

diff --git a/lib/lib.ts b/lib/lib.ts
@@ -277,6 +277,26 @@ export function isStarting<T extends interval>(intervalA: T, intervalB?: T): any
   }
 }
 
+const isEndingGen = ([a]: IntervalSE[], [b]: IntervalSE[]): boolean => {
+  return a.end === b.end;
+};
+
+/**
+ * Test if one interval is before another.
+ */
+export function isEnding<T extends interval>(intervalA: T, intervalB: T): boolean;
+export function isEnding<T extends interval>(intervalA: T): (intervalB: T) => boolean;
+export function isEnding<T extends interval>(intervalA: T, intervalB?: T): any {
+  switch (arguments.length) {
+    case 1:
+      return (tt2: T | T[]): boolean => {
+        return setupForTwoIntsToBool<T>(isEndingGen)(intervalA, tt2);
+      };
+    case 2:
+      return setupForTwoIntsToBool<T>(isEndingGen)(intervalA, intervalB as T);
+  }
+}
+
 const propFromNthArg = (n: number, propName: string) => pipe(nthArg(n), prop(propName));
 
 const unifyGen = pipe(