All new

alle new

node_modules/underscore/modules/_flatten.js

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+import getLength from './_getLength.js';
+import isArrayLike from './_isArrayLike.js';
+import isArray from './isArray.js';
+import isArguments from './isArguments.js';
+
+// Internal implementation of a recursive `flatten` function.
+export default function flatten(input, depth, strict) {
+  if (!depth && depth !== 0) depth = Infinity;
+  var output = [], idx = 0, i = 0, length = getLength(input) || 0, stack = [];
+  while (true) {
+    if (i >= length) {
+      if (!stack.length) break;
+      var frame = stack.pop();
+      i = frame.i;
+      input = frame.v;
+      length = getLength(input);
+      continue;
+    }
+    var value = input[i++];
+    if (stack.length >= depth) {
+      output[idx++] = value;
+    } else if (isArrayLike(value) && (isArray(value) || isArguments(value))) {
+      // Flatten current level of array or arguments object.
+      stack.push({i: i, v: input});
+      i = 0;
+      input = value;
+      length = getLength(input);
+    } else if (!strict) {
+      output[idx++] = value;
+    }
+  }
+  return output;
+}