DusanKasan /
Knapsack
| @@ 834-850 (lines=17) @@ | ||
| 831 | * @param callable $function ($value, $key) |
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| 832 | * @return Collection |
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| 833 | */ |
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| 834 | function dropWhile($collection, callable $function) |
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| 835 | { |
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| 836 | $generatorFactory = function () use ($collection, $function) { |
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| 837 | $shouldDrop = true; |
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| 838 | foreach ($collection as $key => $value) { |
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| 839 | if ($shouldDrop) { |
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| 840 | $shouldDrop = $function($value, $key); |
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| 841 | } |
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| 842 | ||
| 843 | if (!$shouldDrop) { |
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| 844 | yield $key => $value; |
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| 845 | } |
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| 846 | } |
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| 847 | }; |
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| 848 | ||
| 849 | return new Collection($generatorFactory); |
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| 850 | } |
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| 851 | ||
| 852 | /** |
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| 853 | * Returns a lazy collection of items from $collection until first item for which $function returns false. |
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| @@ 859-875 (lines=17) @@ | ||
| 856 | * @param callable $function ($value, $key) |
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| 857 | * @return Collection |
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| 858 | */ |
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| 859 | function takeWhile($collection, callable $function) |
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| 860 | { |
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| 861 | $generatorFactory = function () use ($collection, $function) { |
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| 862 | $shouldTake = true; |
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| 863 | foreach ($collection as $key => $value) { |
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| 864 | if ($shouldTake) { |
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| 865 | $shouldTake = $function($value, $key); |
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| 866 | } |
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| 867 | ||
| 868 | if ($shouldTake) { |
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| 869 | yield $key => $value; |
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| 870 | } |
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| 871 | } |
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| 872 | }; |
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| 873 | ||
| 874 | return new Collection($generatorFactory); |
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| 875 | } |
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| 876 | ||
| 877 | /** |
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| 878 | * Returns a lazy collection. A result of calling map and flatten(1) |
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| @@ 951-964 (lines=14) @@ | ||
| 948 | * @param mixed $startValue |
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| 949 | * @return Collection |
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| 950 | */ |
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| 951 | function reductions($collection, callable $function, $startValue) |
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| 952 | { |
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| 953 | $generatorFactory = function () use ($collection, $function, $startValue) { |
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| 954 | $tmp = duplicate($startValue); |
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| 955 | ||
| 956 | yield $tmp; |
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| 957 | foreach ($collection as $key => $value) { |
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| 958 | $tmp = $function($tmp, $value, $key); |
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| 959 | yield $tmp; |
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| 960 | } |
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| 961 | }; |
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| 962 | ||
| 963 | return new Collection($generatorFactory); |
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| 964 | } |
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| 965 | ||
| 966 | /** |
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| 967 | * Returns a lazy collection of every nth ($step) item in $collection. |
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