summaryrefslogtreecommitdiff
path: root/tools/eslint/node_modules/lodash/_baseFlatten.js
blob: 8a4cb460d711954f7bc921c30f2f5f871726e253 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
var arrayPush = require('./_arrayPush'),
    isArguments = require('./isArguments'),
    isArray = require('./isArray'),
    isArrayLikeObject = require('./isArrayLikeObject');

/**
 * The base implementation of `_.flatten` with support for restricting flattening.
 *
 * @private
 * @param {Array} array The array to flatten.
 * @param {boolean} [isDeep] Specify a deep flatten.
 * @param {boolean} [isStrict] Restrict flattening to arrays-like objects.
 * @param {Array} [result=[]] The initial result value.
 * @returns {Array} Returns the new flattened array.
 */
function baseFlatten(array, isDeep, isStrict, result) {
  result || (result = []);

  var index = -1,
      length = array.length;

  while (++index < length) {
    var value = array[index];
    if (isArrayLikeObject(value) &&
        (isStrict || isArray(value) || isArguments(value))) {
      if (isDeep) {
        // Recursively flatten arrays (susceptible to call stack limits).
        baseFlatten(value, isDeep, isStrict, result);
      } else {
        arrayPush(result, value);
      }
    } else if (!isStrict) {
      result[result.length] = value;
    }
  }
  return result;
}

module.exports = baseFlatten;