DusanKasan /
Knapsack
| @@ 835-851 (lines=17) @@ | ||
| 832 | * @param callable $function ($value, $key) |
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| 833 | * @return Collection |
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| 834 | */ |
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| 835 | function dropWhile($collection, callable $function) |
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| 836 | { |
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| 837 | $generatorFactory = function () use ($collection, $function) { |
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| 838 | $shouldDrop = true; |
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| 839 | foreach ($collection as $key => $value) { |
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| 840 | if ($shouldDrop) { |
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| 841 | $shouldDrop = $function($value, $key); |
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| 842 | } |
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| 843 | ||
| 844 | if (!$shouldDrop) { |
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| 845 | yield $key => $value; |
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| 846 | } |
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| 847 | } |
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| 848 | }; |
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| 849 | ||
| 850 | return new Collection($generatorFactory); |
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| 851 | } |
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| 852 | ||
| 853 | /** |
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| 854 | * Returns a lazy collection of items from $collection until first item for which $function returns false. |
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| @@ 860-876 (lines=17) @@ | ||
| 857 | * @param callable $function ($value, $key) |
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| 858 | * @return Collection |
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| 859 | */ |
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| 860 | function takeWhile($collection, callable $function) |
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| 861 | { |
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| 862 | $generatorFactory = function () use ($collection, $function) { |
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| 863 | $shouldTake = true; |
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| 864 | foreach ($collection as $key => $value) { |
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| 865 | if ($shouldTake) { |
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| 866 | $shouldTake = $function($value, $key); |
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| 867 | } |
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| 868 | ||
| 869 | if ($shouldTake) { |
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| 870 | yield $key => $value; |
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| 871 | } |
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| 872 | } |
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| 873 | }; |
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| 874 | ||
| 875 | return new Collection($generatorFactory); |
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| 876 | } |
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| 877 | ||
| 878 | /** |
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| 879 | * Returns a lazy collection. A result of calling map and flatten(1) |
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| @@ 952-965 (lines=14) @@ | ||
| 949 | * @param mixed $startValue |
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| 950 | * @return Collection |
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| 951 | */ |
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| 952 | function reductions($collection, callable $function, $startValue) |
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| 953 | { |
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| 954 | $generatorFactory = function () use ($collection, $function, $startValue) { |
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| 955 | $tmp = duplicate($startValue); |
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| 956 | ||
| 957 | yield $tmp; |
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| 958 | foreach ($collection as $key => $value) { |
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| 959 | $tmp = $function($tmp, $value, $key); |
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| 960 | yield $tmp; |
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| 961 | } |
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| 962 | }; |
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| 963 | ||
| 964 | return new Collection($generatorFactory); |
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| 965 | } |
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| 966 | ||
| 967 | /** |
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| 968 | * Returns a lazy collection of every nth ($step) item in $collection. |
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