DusanKasan /
Knapsack
| @@ 802-818 (lines=17) @@ | ||
| 799 | * @param callable $function ($value, $key) |
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| 800 | * @return Collection |
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| 801 | */ |
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| 802 | function dropWhile($collection, callable $function) |
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| 803 | { |
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| 804 | $generatorFactory = function () use ($collection, $function) { |
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| 805 | $shouldDrop = true; |
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| 806 | foreach ($collection as $key => $value) { |
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| 807 | if ($shouldDrop) { |
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| 808 | $shouldDrop = $function($value, $key); |
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| 809 | } |
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| 810 | ||
| 811 | if (!$shouldDrop) { |
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| 812 | yield $key => $value; |
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| 813 | } |
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| 814 | } |
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| 815 | }; |
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| 816 | ||
| 817 | return new Collection($generatorFactory); |
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| 818 | } |
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| 819 | ||
| 820 | /** |
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| 821 | * Returns a lazy collection of items from $collection until first item for which $function returns false. |
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| @@ 827-843 (lines=17) @@ | ||
| 824 | * @param callable $function ($value, $key) |
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| 825 | * @return Collection |
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| 826 | */ |
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| 827 | function takeWhile($collection, callable $function) |
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| 828 | { |
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| 829 | $generatorFactory = function () use ($collection, $function) { |
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| 830 | $shouldTake = true; |
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| 831 | foreach ($collection as $key => $value) { |
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| 832 | if ($shouldTake) { |
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| 833 | $shouldTake = $function($value, $key); |
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| 834 | } |
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| 835 | ||
| 836 | if ($shouldTake) { |
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| 837 | yield $key => $value; |
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| 838 | } |
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| 839 | } |
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| 840 | }; |
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| 841 | ||
| 842 | return new Collection($generatorFactory); |
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| 843 | } |
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| 844 | ||
| 845 | /** |
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| 846 | * Returns a lazy collection. A result of calling map and flatten(1) |
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| @@ 919-932 (lines=14) @@ | ||
| 916 | * @param mixed $startValue |
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| 917 | * @return Collection |
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| 918 | */ |
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| 919 | function reductions($collection, callable $function, $startValue) |
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| 920 | { |
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| 921 | $generatorFactory = function () use ($collection, $function, $startValue) { |
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| 922 | $tmp = duplicate($startValue); |
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| 923 | ||
| 924 | yield $tmp; |
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| 925 | foreach ($collection as $key => $value) { |
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| 926 | $tmp = $function($tmp, $value, $key); |
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| 927 | yield $tmp; |
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| 928 | } |
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| 929 | }; |
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| 930 | ||
| 931 | return new Collection($generatorFactory); |
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| 932 | } |
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| 933 | ||
| 934 | /** |
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| 935 | * Returns a lazy collection of every nth ($step) item in $collection. |
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