DusanKasan /
Knapsack
| @@ 233-242 (lines=10) @@ | ||
| 230 | * @param callable $function ($value, $key) |
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| 231 | * @return Collection |
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| 232 | */ |
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| 233 | function map($collection, callable $function) |
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| 234 | { |
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| 235 | $generatorFactory = function () use ($collection, $function) { |
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| 236 | foreach ($collection as $key => $value) { |
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| 237 | yield $key => $function($value, $key); |
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| 238 | } |
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| 239 | }; |
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| 240 | ||
| 241 | return new Collection($generatorFactory); |
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| 242 | } |
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| 243 | ||
| 244 | /** |
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| 245 | * Returns a lazy collection of items from $collection for which $function returns true. |
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| @@ 453-464 (lines=12) @@ | ||
| 450 | * @param callable $function ($value, $key) |
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| 451 | * @return Collection |
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| 452 | */ |
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| 453 | function each($collection, callable $function) |
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| 454 | { |
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| 455 | $generatorFactory = function () use ($collection, $function) { |
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| 456 | foreach ($collection as $key => $value) { |
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| 457 | $function($value, $key); |
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| 458 | ||
| 459 | yield $key => $value; |
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| 460 | } |
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| 461 | }; |
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| 462 | ||
| 463 | return new Collection($generatorFactory); |
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| 464 | } |
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| 465 | ||
| 466 | /** |
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| 467 | * Returns an item with $key key from $collection. If that key is not present, throws ItemNotFound. |
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| @@ 529-538 (lines=10) @@ | ||
| 526 | * @param callable $function ($value, $key) |
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| 527 | * @return Collection |
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| 528 | */ |
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| 529 | function indexBy($collection, callable $function) |
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| 530 | { |
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| 531 | $generatorFactory = function () use ($collection, $function) { |
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| 532 | foreach ($collection as $key => $value) { |
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| 533 | yield $function($value, $key) => $value; |
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| 534 | } |
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| 535 | }; |
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| 536 | ||
| 537 | return new Collection($generatorFactory); |
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| 538 | } |
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| 539 | ||
| 540 | /** |
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| 541 | * 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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