DusanKasan /
Knapsack
| @@ 829-845 (lines=17) @@ | ||
| 826 | * @param callable $function ($value, $key) |
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| 827 | * @return Collection |
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| 828 | */ |
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| 829 | function dropWhile($collection, callable $function) |
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| 830 | { |
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| 831 | $generatorFactory = function () use ($collection, $function) { |
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| 832 | $shouldDrop = true; |
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| 833 | foreach ($collection as $key => $value) { |
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| 834 | if ($shouldDrop) { |
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| 835 | $shouldDrop = $function($value, $key); |
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| 836 | } |
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| 837 | ||
| 838 | if (!$shouldDrop) { |
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| 839 | yield $key => $value; |
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| 840 | } |
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| 841 | } |
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| 842 | }; |
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| 843 | ||
| 844 | return new Collection($generatorFactory); |
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| 845 | } |
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| 846 | ||
| 847 | /** |
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| 848 | * Returns a lazy collection of items from $collection until first item for which $function returns false. |
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| @@ 854-870 (lines=17) @@ | ||
| 851 | * @param callable $function ($value, $key) |
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| 852 | * @return Collection |
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| 853 | */ |
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| 854 | function takeWhile($collection, callable $function) |
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| 855 | { |
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| 856 | $generatorFactory = function () use ($collection, $function) { |
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| 857 | $shouldTake = true; |
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| 858 | foreach ($collection as $key => $value) { |
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| 859 | if ($shouldTake) { |
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| 860 | $shouldTake = $function($value, $key); |
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| 861 | } |
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| 862 | ||
| 863 | if ($shouldTake) { |
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| 864 | yield $key => $value; |
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| 865 | } |
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| 866 | } |
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| 867 | }; |
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| 868 | ||
| 869 | return new Collection($generatorFactory); |
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| 870 | } |
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| 871 | ||
| 872 | /** |
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| 873 | * Returns a lazy collection. A result of calling map and flatten(1) |
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| @@ 946-959 (lines=14) @@ | ||
| 943 | * @param mixed $startValue |
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| 944 | * @return Collection |
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| 945 | */ |
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| 946 | function reductions($collection, callable $function, $startValue) |
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| 947 | { |
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| 948 | $generatorFactory = function () use ($collection, $function, $startValue) { |
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| 949 | $tmp = duplicate($startValue); |
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| 950 | ||
| 951 | yield $tmp; |
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| 952 | foreach ($collection as $key => $value) { |
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| 953 | $tmp = $function($tmp, $value, $key); |
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| 954 | yield $tmp; |
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| 955 | } |
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| 956 | }; |
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| 957 | ||
| 958 | return new Collection($generatorFactory); |
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| 959 | } |
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| 960 | ||
| 961 | /** |
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| 962 | * Returns a lazy collection of every nth ($step) item in $collection. |
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