Last change
on this file since 6a3a178 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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[6a3a178] | 1 | var arrayPush = require('./_arrayPush'),
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| 2 | isFlattenable = require('./_isFlattenable');
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| 3 |
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| 4 | /**
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| 5 | * The base implementation of `_.flatten` with support for restricting flattening.
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| 6 | *
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| 7 | * @private
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| 8 | * @param {Array} array The array to flatten.
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| 9 | * @param {number} depth The maximum recursion depth.
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| 10 | * @param {boolean} [predicate=isFlattenable] The function invoked per iteration.
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| 11 | * @param {boolean} [isStrict] Restrict to values that pass `predicate` checks.
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| 12 | * @param {Array} [result=[]] The initial result value.
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| 13 | * @returns {Array} Returns the new flattened array.
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| 14 | */
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| 15 | function baseFlatten(array, depth, predicate, isStrict, result) {
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| 16 | var index = -1,
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| 17 | length = array.length;
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| 18 |
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| 19 | predicate || (predicate = isFlattenable);
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| 20 | result || (result = []);
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| 21 |
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| 22 | while (++index < length) {
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| 23 | var value = array[index];
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| 24 | if (depth > 0 && predicate(value)) {
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| 25 | if (depth > 1) {
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| 26 | // Recursively flatten arrays (susceptible to call stack limits).
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| 27 | baseFlatten(value, depth - 1, predicate, isStrict, result);
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| 28 | } else {
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| 29 | arrayPush(result, value);
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| 30 | }
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| 31 | } else if (!isStrict) {
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| 32 | result[result.length] = value;
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| 33 | }
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| 34 | }
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| 35 | return result;
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| 36 | }
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| 37 |
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| 38 | module.exports = baseFlatten;
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