| 1 | var baseFlatten = require('./_baseFlatten'),
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| 2 | map = require('./map'),
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| 3 | toInteger = require('./toInteger');
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| 4 |
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| 5 | /**
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| 6 | * This method is like `_.flatMap` except that it recursively flattens the
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| 7 | * mapped results up to `depth` times.
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| 8 | *
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| 9 | * @static
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| 10 | * @memberOf _
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| 11 | * @since 4.7.0
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| 12 | * @category Collection
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| 13 | * @param {Array|Object} collection The collection to iterate over.
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| 14 | * @param {Function} [iteratee=_.identity] The function invoked per iteration.
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| 15 | * @param {number} [depth=1] The maximum recursion depth.
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| 16 | * @returns {Array} Returns the new flattened array.
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| 17 | * @example
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| 18 | *
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| 19 | * function duplicate(n) {
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| 20 | * return [[[n, n]]];
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| 21 | * }
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| 22 | *
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| 23 | * _.flatMapDepth([1, 2], duplicate, 2);
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| 24 | * // => [[1, 1], [2, 2]]
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| 25 | */
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| 26 | function flatMapDepth(collection, iteratee, depth) {
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| 27 | depth = depth === undefined ? 1 : toInteger(depth);
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| 28 | return baseFlatten(map(collection, iteratee), depth);
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| 29 | }
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| 30 |
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| 31 | module.exports = flatMapDepth;
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