DusanKasan /
Knapsack
| @@ 234-243 (lines=10) @@ | ||
| 231 | * @param callable $function ($value, $key) |
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| 232 | * @return Collection |
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| 233 | */ |
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| 234 | function map($collection, callable $function) |
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| 235 | { |
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| 236 | $generatorFactory = function () use ($collection, $function) { |
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| 237 | foreach ($collection as $key => $value) { |
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| 238 | yield $key => $function($value, $key); |
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| 239 | } |
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| 240 | }; |
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| 241 | ||
| 242 | return new Collection($generatorFactory); |
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| 243 | } |
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| 244 | ||
| 245 | /** |
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| 246 | * Returns a lazy collection of items from $collection for which $function returns true. |
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| @@ 252-263 (lines=12) @@ | ||
| 249 | * @param callable $function ($value, $key) |
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| 250 | * @return Collection |
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| 251 | */ |
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| 252 | function filter($collection, callable $function) |
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| 253 | { |
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| 254 | $generatorFactory = function () use ($collection, $function) { |
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| 255 | foreach ($collection as $key => $value) { |
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| 256 | if ($function($value, $key)) { |
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| 257 | yield $key => $value; |
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| 258 | } |
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| 259 | } |
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| 260 | }; |
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| 261 | ||
| 262 | return new Collection($generatorFactory); |
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| 263 | } |
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| 264 | ||
| 265 | /** |
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| 266 | * Returns a lazy collection with items from all $collections passed as argument appended together |
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| @@ 442-453 (lines=12) @@ | ||
| 439 | * @param callable $function ($value, $key) |
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| 440 | * @return Collection |
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| 441 | */ |
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| 442 | function each($collection, callable $function) |
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| 443 | { |
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| 444 | $generatorFactory = function () use ($collection, $function) { |
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| 445 | foreach ($collection as $key => $value) { |
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| 446 | $function($value, $key); |
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| 447 | ||
| 448 | yield $key => $value; |
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| 449 | } |
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| 450 | }; |
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| 451 | ||
| 452 | return new Collection($generatorFactory); |
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| 453 | } |
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| 454 | ||
| 455 | /** |
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| 456 | * Returns an item with $key key from $collection. If that key is not present, throws ItemNotFound. |
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| @@ 518-527 (lines=10) @@ | ||
| 515 | * @param callable $function ($value, $key) |
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| 516 | * @return Collection |
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| 517 | */ |
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| 518 | function indexBy($collection, callable $function) |
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| 519 | { |
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| 520 | $generatorFactory = function () use ($collection, $function) { |
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| 521 | foreach ($collection as $key => $value) { |
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| 522 | yield $function($value, $key) => $value; |
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| 523 | } |
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| 524 | }; |
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| 525 | ||
| 526 | return new Collection($generatorFactory); |
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| 527 | } |
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| 528 | ||
| 529 | /** |
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| 530 | * 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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