feat(lib): add equal test

js-republic · Nov 25, 2017 · 93d133c · 93d133c
1 parent 8013ee6
commit 93d133c
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diff --git a/lib/lib.test.ts b/lib/lib.test.ts
@@ -8,6 +8,7 @@ import {
   isBefore,
   isDuring,
   isEnding,
+  isEqual,
   isMeeting,
   isOverlapping,
   isStarting,
@@ -68,6 +69,20 @@ const testFnToIntervals = (
   t.throws(fn.bind(null, [{ test: 1 }], { test: 1 }), 'Unrecognized interval format');
 };
 
+test('will find equal', t => {
+  const i1 = { start: 0, end: 42 };
+  const i2 = { start: 0, end: 42 };
+  const testOutputFn = t.true.bind(t);
+  testFnToBoolean(i1, i2, isEqual, testOutputFn);
+});
+
+test('will not find equal', t => {
+  const i1 = { start: 0, end: 9 };
+  const i2 = { start: 0, end: 8 };
+  const testOutputFn = t.false.bind(t);
+  testFnToBoolean(i1, i2, isEqual, testOutputFn);
+});
+
 test('will find during', t => {
   const i1 = { start: 1, end: 8 };
   const i2 = { start: 0, end: 8 };

diff --git a/lib/lib.ts b/lib/lib.ts
@@ -287,6 +287,19 @@ export function isDuring<T extends interval>(intervalA: T, intervalB?: T): any {
   return curryBool<T>(arguments.length, intervalA, intervalB, isDuringGen);
 }
 
+const isEqualGen = ([a]: IntervalSE[], [b]: IntervalSE[]): boolean => {
+  return a.start === b.start && a.end === b.end;
+};
+
+/**
+ * Test if one interval is before another.
+ */
+export function isEqual<T extends interval>(intervalA: T, intervalB: T): boolean;
+export function isEqual<T extends interval>(intervalA: T): (intervalB: T) => boolean;
+export function isEqual<T extends interval>(intervalA: T, intervalB?: T): any {
+  return curryBool<T>(arguments.length, intervalA, intervalB, isEqualGen);
+}
+
 const propFromNthArg = (n: number, propName: string) => pipe(nthArg(n), prop(propName));
 
 const unifyGen = pipe(