DusanKasan /
Knapsack
| @@ 831-847 (lines=17) @@ | ||
| 828 | * @param callable $function ($value, $key) |
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| 829 | * @return Collection |
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| 830 | */ |
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| 831 | function dropWhile($collection, callable $function) |
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| 832 | { |
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| 833 | $generatorFactory = function () use ($collection, $function) { |
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| 834 | $shouldDrop = true; |
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| 835 | foreach ($collection as $key => $value) { |
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| 836 | if ($shouldDrop) { |
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| 837 | $shouldDrop = $function($value, $key); |
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| 838 | } |
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| 839 | ||
| 840 | if (!$shouldDrop) { |
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| 841 | yield $key => $value; |
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| 842 | } |
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| 843 | } |
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| 844 | }; |
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| 845 | ||
| 846 | return new Collection($generatorFactory); |
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| 847 | } |
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| 848 | ||
| 849 | /** |
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| 850 | * Returns a lazy collection of items from $collection until first item for which $function returns false. |
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| @@ 856-872 (lines=17) @@ | ||
| 853 | * @param callable $function ($value, $key) |
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| 854 | * @return Collection |
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| 855 | */ |
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| 856 | function takeWhile($collection, callable $function) |
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| 857 | { |
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| 858 | $generatorFactory = function () use ($collection, $function) { |
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| 859 | $shouldTake = true; |
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| 860 | foreach ($collection as $key => $value) { |
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| 861 | if ($shouldTake) { |
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| 862 | $shouldTake = $function($value, $key); |
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| 863 | } |
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| 864 | ||
| 865 | if ($shouldTake) { |
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| 866 | yield $key => $value; |
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| 867 | } |
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| 868 | } |
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| 869 | }; |
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| 870 | ||
| 871 | return new Collection($generatorFactory); |
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| 872 | } |
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| 873 | ||
| 874 | /** |
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| 875 | * Returns a lazy collection. A result of calling map and flatten(1) |
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| @@ 948-961 (lines=14) @@ | ||
| 945 | * @param mixed $startValue |
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| 946 | * @return Collection |
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| 947 | */ |
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| 948 | function reductions($collection, callable $function, $startValue) |
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| 949 | { |
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| 950 | $generatorFactory = function () use ($collection, $function, $startValue) { |
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| 951 | $tmp = duplicate($startValue); |
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| 952 | ||
| 953 | yield $tmp; |
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| 954 | foreach ($collection as $key => $value) { |
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| 955 | $tmp = $function($tmp, $value, $key); |
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| 956 | yield $tmp; |
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| 957 | } |
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| 958 | }; |
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| 959 | ||
| 960 | return new Collection($generatorFactory); |
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| 961 | } |
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| 962 | ||
| 963 | /** |
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| 964 | * Returns a lazy collection of every nth ($step) item in $collection. |
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