You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
39 lines
1.2 KiB
39 lines
1.2 KiB
4 years ago
|
var arrayPush = require('./_arrayPush'),
|
||
|
|
isFlattenable = require('./_isFlattenable');
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
function baseFlatten(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(value, depth - 1, predicate, isStrict, result);
|
||
|
|
} else {
|
||
|
|
arrayPush(result, value);
|
||
|
|
}
|
||
|
|
} else if (!isStrict) {
|
||
|
|
result[result.length] = value;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = baseFlatten;
|