more diagonal work (unfinished)

src/vector.js

@@ -28,6 +28,19 @@ export function vectorIsZero(value) {
 }
 
 
+export function vectorEquals(a, b) {
+    if (a === b) return true
+    if (a === null && b !== null || a !== null && b === null) return false
+    // noinspection JSObjectNullOrUndefined
+    if (a.length !== b.length )
+        return false
+    for (let i = 0; i < a.length; i++)
+        if (a[i] !== b[i])
+            return false
+    return true
+}
+
+
 export function vectorAdd(a, b) {
     const result = []
     const scalarB = b.length === undefined