DusanKasan /
Knapsack
| @@ 824-840 (lines=17) @@ | ||
| 821 | * @param callable $function ($value, $key) |
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| 822 | * @return Collection |
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| 823 | */ |
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| 824 | function dropWhile($collection, callable $function) |
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| 825 | { |
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| 826 | $generatorFactory = function () use ($collection, $function) { |
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| 827 | $shouldDrop = true; |
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| 828 | foreach ($collection as $key => $value) { |
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| 829 | if ($shouldDrop) { |
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| 830 | $shouldDrop = $function($value, $key); |
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| 831 | } |
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| 832 | ||
| 833 | if (!$shouldDrop) { |
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| 834 | yield $key => $value; |
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| 835 | } |
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| 836 | } |
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| 837 | }; |
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| 838 | ||
| 839 | return new Collection($generatorFactory); |
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| 840 | } |
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| 841 | ||
| 842 | /** |
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| 843 | * Returns a lazy collection of items from $collection until first item for which $function returns false. |
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| @@ 849-865 (lines=17) @@ | ||
| 846 | * @param callable $function ($value, $key) |
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| 847 | * @return Collection |
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| 848 | */ |
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| 849 | function takeWhile($collection, callable $function) |
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| 850 | { |
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| 851 | $generatorFactory = function () use ($collection, $function) { |
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| 852 | $shouldTake = true; |
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| 853 | foreach ($collection as $key => $value) { |
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| 854 | if ($shouldTake) { |
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| 855 | $shouldTake = $function($value, $key); |
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| 856 | } |
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| 857 | ||
| 858 | if ($shouldTake) { |
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| 859 | yield $key => $value; |
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| 860 | } |
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| 861 | } |
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| 862 | }; |
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| 863 | ||
| 864 | return new Collection($generatorFactory); |
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| 865 | } |
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| 866 | ||
| 867 | /** |
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| 868 | * Returns a lazy collection. A result of calling map and flatten(1) |
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| @@ 941-954 (lines=14) @@ | ||
| 938 | * @param mixed $startValue |
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| 939 | * @return Collection |
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| 940 | */ |
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| 941 | function reductions($collection, callable $function, $startValue) |
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| 942 | { |
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| 943 | $generatorFactory = function () use ($collection, $function, $startValue) { |
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| 944 | $tmp = duplicate($startValue); |
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| 945 | ||
| 946 | yield $tmp; |
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| 947 | foreach ($collection as $key => $value) { |
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| 948 | $tmp = $function($tmp, $value, $key); |
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| 949 | yield $tmp; |
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| 950 | } |
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| 951 | }; |
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| 952 | ||
| 953 | return new Collection($generatorFactory); |
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| 954 | } |
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| 955 | ||
| 956 | /** |
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| 957 | * Returns a lazy collection of every nth ($step) item in $collection. |
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