Added iterCuEveryBy function and test

iterCuEveryBy/iterCuEveryBy.js

@@ -0,0 +1,23 @@
+// Import the necessary module
+var array2iterator = require('@stdlib/array/to-iterator');
+
+// Define the function iterCuEveryBy
+function iterCuEveryBy(iterator, predicate) {
+    let index = 0;  // to keep track of the iteration index
+    let cumulated = true;  // to track cumulative test result
+
+    return {
+        next() {
+            const nextValue = iterator.next();
+            if (nextValue.done) {
+                return { value: undefined, done: true };
+            }
+
+            cumulated = cumulated && predicate(nextValue.value, index++);
+            return { value: cumulated, done: false };
+        }
+    };
+}
+
+// Export the function for use in other files
+module.exports = iterCuEveryBy;

iterCuEveryBy/test.js

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+// Import the necessary modules
+var array2iterator = require('@stdlib/array/to-iterator');
+var iterCuEveryBy = require('./iterCuEveryBy');
+
+// Define a predicate function
+function isPositive(value) {
+    return (value > 0);
+}
+
+// Convert an array to an iterator
+var arr = array2iterator([1, 1, 1, 0, 1]);
+
+// Create a cumulative test iterator
+var it = iterCuEveryBy(arr, isPositive);
+
+// Test the iterator
+console.log(it.next().value);  // true
+console.log(it.next().value);  // true
+console.log(it.next().value);  // true
+console.log(it.next().value);  // false
+console.log(it.next().value);  // false
+console.log(it.next().done);   // true