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backend/node_modules/obliterator/iterator.js

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+/**
+ * Obliterator Iterator Class
+ * ===========================
+ *
+ * Simple class representing the library's iterators.
+ */
+
+/**
+ * Iterator class.
+ *
+ * @constructor
+ * @param {function} next - Next function.
+ */
+function Iterator(next) {
+  if (typeof next !== 'function')
+    throw new Error('obliterator/iterator: expecting a function!');
+
+  this.next = next;
+}
+
+/**
+ * If symbols are supported, we add `next` to `Symbol.iterator`.
+ */
+if (typeof Symbol !== 'undefined')
+  Iterator.prototype[Symbol.iterator] = function () {
+    return this;
+  };
+
+/**
+ * Returning an iterator of the given values.
+ *
+ * @param  {any...} values - Values.
+ * @return {Iterator}
+ */
+Iterator.of = function () {
+  var args = arguments,
+    l = args.length,
+    i = 0;
+
+  return new Iterator(function () {
+    if (i >= l) return {done: true};
+
+    return {done: false, value: args[i++]};
+  });
+};
+
+/**
+ * Returning an empty iterator.
+ *
+ * @return {Iterator}
+ */
+Iterator.empty = function () {
+  var iterator = new Iterator(function () {
+    return {done: true};
+  });
+
+  return iterator;
+};
+
+/**
+ * Returning an iterator over the given indexed sequence.
+ *
+ * @param  {string|Array} sequence - Target sequence.
+ * @return {Iterator}
+ */
+Iterator.fromSequence = function (sequence) {
+  var i = 0,
+    l = sequence.length;
+
+  return new Iterator(function () {
+    if (i >= l) return {done: true};
+
+    return {done: false, value: sequence[i++]};
+  });
+};
+
+/**
+ * Returning whether the given value is an iterator.
+ *
+ * @param  {any} value - Value.
+ * @return {boolean}
+ */
+Iterator.is = function (value) {
+  if (value instanceof Iterator) return true;
+
+  return (
+    typeof value === 'object' &&
+    value !== null &&
+    typeof value.next === 'function'
+  );
+};
+
+/**
+ * Exporting.
+ */
+module.exports = Iterator;