react app

react-app/node_modules/lodash/utility/range.js

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+var isIterateeCall = require('../internal/isIterateeCall');
+
+/* Native method references for those with the same name as other `lodash` methods. */
+var nativeCeil = Math.ceil,
+    nativeMax = Math.max;
+
+/**
+ * Creates an array of numbers (positive and/or negative) progressing from
+ * `start` up to, but not including, `end`. If `end` is not specified it's
+ * set to `start` with `start` then set to `0`. If `end` is less than `start`
+ * a zero-length range is created unless a negative `step` is specified.
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @param {number} [start=0] The start of the range.
+ * @param {number} end The end of the range.
+ * @param {number} [step=1] The value to increment or decrement by.
+ * @returns {Array} Returns the new array of numbers.
+ * @example
+ *
+ * _.range(4);
+ * // => [0, 1, 2, 3]
+ *
+ * _.range(1, 5);
+ * // => [1, 2, 3, 4]
+ *
+ * _.range(0, 20, 5);
+ * // => [0, 5, 10, 15]
+ *
+ * _.range(0, -4, -1);
+ * // => [0, -1, -2, -3]
+ *
+ * _.range(1, 4, 0);
+ * // => [1, 1, 1]
+ *
+ * _.range(0);
+ * // => []
+ */
+function range(start, end, step) {
+  if (step && isIterateeCall(start, end, step)) {
+    end = step = undefined;
+  }
+  start = +start || 0;
+  step = step == null ? 1 : (+step || 0);
+
+  if (end == null) {
+    end = start;
+    start = 0;
+  } else {
+    end = +end || 0;
+  }
+  // Use `Array(length)` so engines like Chakra and V8 avoid slower modes.
+  // See https://youtu.be/XAqIpGU8ZZk#t=17m25s for more details.
+  var index = -1,
+      length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),
+      result = Array(length);
+
+  while (++index < length) {
+    result[index] = start;
+    start += step;
+  }
+  return result;
+}
+
+module.exports = range;