DusanKasan /
Knapsack
| @@ 779-794 (lines=16) @@ | ||
| 776 | * @param mixed|null $key |
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| 777 | * @return Collection |
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| 778 | */ |
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| 779 | function prepend($collection, $value, $key = null) |
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| 780 | { |
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| 781 | $generatorFactory = function () use ($collection, $value, $key) { |
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| 782 | if ($key === null) { |
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| 783 | yield $value; |
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| 784 | } else { |
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| 785 | yield $key => $value; |
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| 786 | } |
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| 787 | ||
| 788 | foreach ($collection as $key => $value) { |
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| 789 | yield $key => $value; |
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| 790 | } |
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| 791 | }; |
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| 792 | ||
| 793 | return new Collection($generatorFactory); |
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| 794 | } |
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| 795 | ||
| 796 | /** |
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| 797 | * Returns a lazy collection of items in $collection with $value added as last element. If $key is not provided |
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| @@ 805-820 (lines=16) @@ | ||
| 802 | * @param mixed|null $key |
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| 803 | * @return Collection |
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| 804 | */ |
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| 805 | function append($collection, $value, $key = null) |
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| 806 | { |
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| 807 | $generatorFactory = function () use ($collection, $value, $key) { |
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| 808 | foreach ($collection as $k => $v) { |
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| 809 | yield $k => $v; |
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| 810 | } |
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| 811 | ||
| 812 | if ($key === null) { |
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| 813 | yield $value; |
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| 814 | } else { |
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| 815 | yield $key => $value; |
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| 816 | } |
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| 817 | }; |
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| 818 | ||
| 819 | return new Collection($generatorFactory); |
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| 820 | } |
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| 821 | ||
| 822 | /** |
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| 823 | * Returns a lazy collection by removing items from $collection until first item for which $function returns false. |
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