dist/joiner.node.js
function baseFlatten$1(array, depth, predicate, isStrict, result) {
  var index = -1,
      length = array.length;

  predicate || (predicate = isFlattenable);
  result || (result = []);

  while (++index < length) {
    var value = array[index];
    if (depth > 0 && predicate(value)) {
      if (depth > 1) {
        // Recursively flatten arrays (susceptible to call stack limits).
        baseFlatten$1(value, depth - 1, predicate, isStrict, result);
      } else {
        arrayPush$3(result, value);
      }
    } else if (!isStrict) {
      result[result.length] = value;
    }
  }
  return result;
}
function baseFlatten$1(array, depth, predicate, isStrict, result) {
  var index = -1,
      length = array.length;

  predicate || (predicate = isFlattenable);
  result || (result = []);

  while (++index < length) {
    var value = array[index];
    if (depth > 0 && predicate(value)) {
      if (depth > 1) {
        // Recursively flatten arrays (susceptible to call stack limits).
        baseFlatten$1(value, depth - 1, predicate, isStrict, result);
      } else {
        arrayPush$3(result, value);
      }
    } else if (!isStrict) {
      result[result.length] = value;
    }
  }
  return result;
}
function baseFlatten$1 ( array , depth , predicate , isStrict , result ) { var index = - 1 , length = array . length ; predicate || ( predicate = isFlattenable ) ; result || ( result = [ ] ) ; while ( ++ index < length ) { var value = array [ index ] ; if ( depth > 0 && predicate ( value ) ) { if ( depth > 1 ) { // Recursively flatten arrays (susceptible to call stack limits). baseFlatten$1 ( value , depth - 1 , predicate , isStrict , result ) ; } else { arrayPush$3 ( result , value ) ; } } else if ( ! isStrict ) { result [ result . length ] = value ; } } return result ; }
The base implementation of `_.flatten` with support for restricting flattening.

@private
@param {Array} array The array to flatten.
@param {number} depth The maximum recursion depth.
@param {boolean} [predicate=isFlattenable] The function invoked per iteration.
@param {boolean} [isStrict] Restrict to values that pass `predicate` checks.
@param {Array} [result=[]] The initial result value.
@returns {Array} Returns the new flattened array.
The base implementation of _ . flatten with support for restricting flattening .