DusanKasan /
Knapsack
| @@ 232-241 (lines=10) @@ | ||
| 229 | * @param callable $function ($value, $key) |
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| 230 | * @return Collection |
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| 231 | */ |
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| 232 | function map($collection, callable $function) |
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| 233 | { |
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| 234 | $generatorFactory = function () use ($collection, $function) { |
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| 235 | foreach ($collection as $key => $value) { |
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| 236 | yield $key => $function($value, $key); |
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| 237 | } |
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| 238 | }; |
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| 239 | ||
| 240 | return new Collection($generatorFactory); |
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| 241 | } |
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| 242 | ||
| 243 | /** |
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| 244 | * Returns a lazy collection of items from $collection for which $function returns true. |
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| @@ 452-463 (lines=12) @@ | ||
| 449 | * @param callable $function ($value, $key) |
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| 450 | * @return Collection |
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| 451 | */ |
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| 452 | function each($collection, callable $function) |
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| 453 | { |
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| 454 | $generatorFactory = function () use ($collection, $function) { |
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| 455 | foreach ($collection as $key => $value) { |
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| 456 | $function($value, $key); |
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| 457 | ||
| 458 | yield $key => $value; |
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| 459 | } |
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| 460 | }; |
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| 461 | ||
| 462 | return new Collection($generatorFactory); |
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| 463 | } |
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| 464 | ||
| 465 | /** |
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| 466 | * Returns an item with $key key from $collection. If that key is not present, throws ItemNotFound. |
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| @@ 528-537 (lines=10) @@ | ||
| 525 | * @param callable $function ($value, $key) |
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| 526 | * @return Collection |
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| 527 | */ |
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| 528 | function indexBy($collection, callable $function) |
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| 529 | { |
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| 530 | $generatorFactory = function () use ($collection, $function) { |
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| 531 | foreach ($collection as $key => $value) { |
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| 532 | yield $function($value, $key) => $value; |
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| 533 | } |
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| 534 | }; |
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| 535 | ||
| 536 | return new Collection($generatorFactory); |
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| 537 | } |
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| 538 | ||
| 539 | /** |
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| 540 | * 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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