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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| @@ 251-262 (lines=12) @@ | ||
| 248 | * @param callable $function ($value, $key) |
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| 249 | * @return Collection |
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| 250 | */ |
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| 251 | function filter($collection, callable $function) |
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| 252 | { |
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| 253 | $generatorFactory = function () use ($collection, $function) { |
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| 254 | foreach ($collection as $key => $value) { |
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| 255 | if ($function($value, $key)) { |
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| 256 | yield $key => $value; |
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| 257 | } |
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| 258 | } |
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| 259 | }; |
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| 260 | ||
| 261 | return new Collection($generatorFactory); |
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| 262 | } |
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| 263 | ||
| 264 | /** |
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| 265 | * Returns a lazy collection with items from all $collections passed as argument appended together |
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| @@ 447-458 (lines=12) @@ | ||
| 444 | * @param callable $function ($value, $key) |
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| 445 | * @return Collection |
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| 446 | */ |
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| 447 | function each($collection, callable $function) |
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| 448 | { |
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| 449 | $generatorFactory = function () use ($collection, $function) { |
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| 450 | foreach ($collection as $key => $value) { |
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| 451 | $function($value, $key); |
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| 452 | ||
| 453 | yield $key => $value; |
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| 454 | } |
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| 455 | }; |
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| 456 | ||
| 457 | return new Collection($generatorFactory); |
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| 458 | } |
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| 459 | ||
| 460 | /** |
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| 461 | * Returns an item with $key key from $collection. If that key is not present, throws ItemNotFound. |
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| @@ 523-532 (lines=10) @@ | ||
| 520 | * @param callable $function ($value, $key) |
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| 521 | * @return Collection |
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| 522 | */ |
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| 523 | function indexBy($collection, callable $function) |
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| 524 | { |
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| 525 | $generatorFactory = function () use ($collection, $function) { |
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| 526 | foreach ($collection as $key => $value) { |
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| 527 | yield $function($value, $key) => $value; |
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| 528 | } |
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| 529 | }; |
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| 530 | ||
| 531 | return new Collection($generatorFactory); |
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| 532 | } |
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| 533 | ||
| 534 | /** |
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| 535 | * 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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