DusanKasan /
Knapsack
| @@ 230-239 (lines=10) @@ | ||
| 227 | * @param callable $function ($value, $key) |
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| 228 | * @return Collection |
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| 229 | */ |
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| 230 | function map($collection, callable $function) |
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| 231 | { |
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| 232 | $generatorFactory = function () use ($collection, $function) { |
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| 233 | foreach ($collection as $key => $value) { |
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| 234 | yield $key => $function($value, $key); |
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| 235 | } |
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| 236 | }; |
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| 237 | ||
| 238 | return new Collection($generatorFactory); |
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| 239 | } |
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| 240 | ||
| 241 | /** |
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| 242 | * Returns a lazy collection of items from $collection for which $function returns true. |
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| @@ 451-462 (lines=12) @@ | ||
| 448 | * @param callable $function ($value, $key) |
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| 449 | * @return Collection |
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| 450 | */ |
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| 451 | function each($collection, callable $function) |
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| 452 | { |
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| 453 | $generatorFactory = function () use ($collection, $function) { |
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| 454 | foreach ($collection as $key => $value) { |
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| 455 | $function($value, $key); |
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| 456 | ||
| 457 | yield $key => $value; |
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| 458 | } |
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| 459 | }; |
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| 460 | ||
| 461 | return new Collection($generatorFactory); |
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| 462 | } |
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| 463 | ||
| 464 | /** |
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| 465 | * Returns an item with $key key from $collection. If that key is not present, throws ItemNotFound. |
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| @@ 527-536 (lines=10) @@ | ||
| 524 | * @param callable $function ($value, $key) |
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| 525 | * @return Collection |
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| 526 | */ |
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| 527 | function indexBy($collection, callable $function) |
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| 528 | { |
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| 529 | $generatorFactory = function () use ($collection, $function) { |
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| 530 | foreach ($collection as $key => $value) { |
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| 531 | yield $function($value, $key) => $value; |
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| 532 | } |
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| 533 | }; |
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| 534 | ||
| 535 | return new Collection($generatorFactory); |
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| 536 | } |
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| 537 | ||
| 538 | /** |
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| 539 | * Returns a non-lazy collection of items whose keys are the return values of $function and values are the number of |
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