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backend/node_modules/obliterator/range.js

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+/**
+ * Obliterator Range Function
+ * ===========================
+ *
+ * Function returning a range iterator.
+ */
+var Iterator = require('./iterator.js');
+
+/**
+ * Range.
+ *
+ * @param  {number} start - Start.
+ * @param  {number} end   - End.
+ * @param  {number} step  - Step.
+ * @return {Iterator}
+ */
+module.exports = function range(start, end, step) {
+  if (arguments.length === 1) {
+    end = start;
+    start = 0;
+  }
+
+  if (arguments.length < 3) step = 1;
+
+  var i = start;
+
+  var iterator = new Iterator(function () {
+    if (i < end) {
+      var value = i;
+
+      i += step;
+
+      return {value: value, done: false};
+    }
+
+    return {done: true};
+  });
+
+  iterator.start = start;
+  iterator.end = end;
+  iterator.step = step;
+
+  return iterator;
+};