DusanKasan /
Knapsack
| @@ 238-247 (lines=10) @@ | ||
| 235 | * @param callable $function ($value, $key) |
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| 236 | * @return Collection |
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| 237 | */ |
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| 238 | function map($collection, callable $function) |
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| 239 | { |
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| 240 | $generatorFactory = function () use ($collection, $function) { |
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| 241 | foreach ($collection as $key => $value) { |
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| 242 | yield $key => $function($value, $key); |
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| 243 | } |
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| 244 | }; |
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| 245 | ||
| 246 | return new Collection($generatorFactory); |
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| 247 | } |
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| 248 | ||
| 249 | /** |
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| 250 | * Returns a lazy collection of items from $collection for which $function returns true. |
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| @@ 256-267 (lines=12) @@ | ||
| 253 | * @param callable $function ($value, $key) |
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| 254 | * @return Collection |
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| 255 | */ |
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| 256 | function filter($collection, callable $function) |
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| 257 | { |
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| 258 | $generatorFactory = function () use ($collection, $function) { |
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| 259 | foreach ($collection as $key => $value) { |
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| 260 | if ($function($value, $key)) { |
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| 261 | yield $key => $value; |
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| 262 | } |
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| 263 | } |
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| 264 | }; |
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| 265 | ||
| 266 | return new Collection($generatorFactory); |
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| 267 | } |
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| 268 | ||
| 269 | /** |
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| 270 | * Returns a lazy collection with items from $collection2 appended at the end of $collection1 |
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| @@ 424-435 (lines=12) @@ | ||
| 421 | * @param callable $function ($value, $key) |
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| 422 | * @return Collection |
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| 423 | */ |
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| 424 | function each($collection, callable $function) |
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| 425 | { |
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| 426 | $generatorFactory = function () use ($collection, $function) { |
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| 427 | foreach ($collection as $key => $value) { |
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| 428 | $function($value, $key); |
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| 429 | ||
| 430 | yield $key => $value; |
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| 431 | } |
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| 432 | }; |
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| 433 | ||
| 434 | return new Collection($generatorFactory); |
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| 435 | } |
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| 436 | ||
| 437 | /** |
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| 438 | * Returns an item with $key key from $collection. If that key is not present, throws ItemNotFound. |
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| @@ 500-509 (lines=10) @@ | ||
| 497 | * @param callable $function ($value, $key) |
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| 498 | * @return Collection |
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| 499 | */ |
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| 500 | function indexBy($collection, callable $function) |
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| 501 | { |
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| 502 | $generatorFactory = function () use ($collection, $function) { |
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| 503 | foreach ($collection as $key => $value) { |
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| 504 | yield $function($value, $key) => $value; |
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| 505 | } |
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| 506 | }; |
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| 507 | ||
| 508 | return new Collection($generatorFactory); |
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| 509 | } |
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| 510 | ||
| 511 | /** |
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| 512 | * 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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