rfc:arrow_function_preference
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| Both sides previous revision Previous revision Next revision | Previous revision | ||
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rfc:arrow_function_preference [2017/07/05 06:02] levim Add 3rd option? |
rfc:arrow_function_preference [2017/07/06 16:55] levim |
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| This syntax would restrict the ability to add object literals a-la JavaScript. Specifically it would prevent the ability to use arbitrary expressions as object literal keys. | This syntax would restrict the ability to add object literals a-la JavaScript. Specifically it would prevent the ability to use arbitrary expressions as object literal keys. | ||
| - | |||
| - | ==== Option 3 ==== | ||
| - | |||
| - | This option is the same as option 1 except that instead of adding a new keyword ''T_FN'' we just re-use ''T_FUNCTION'': | ||
| - | |||
| - | T_FUNCTION '(' parameter_list ')' T_DOUBLE_ARROW expr | ||
| ===== Examples ===== | ===== Examples ===== | ||
| - | Here are some snippets from real code-bases converted to use the three syntaxes: | + | Here are some snippets from real code-bases converted to use the syntaxes: |
| <PHP> | <PHP> | ||
| $s1 = fn($c) => $callable($factory($c), $c); | $s1 = fn($c) => $callable($factory($c), $c); | ||
| $s2 = {$c => $callable($factory($c), $c)}; | $s2 = {$c => $callable($factory($c), $c)}; | ||
| - | $s3 = function ($c) => $callable($factory($c), $c); | + | </PHP> |
| + | <PHP> | ||
| $this->existingSchemaPaths = array_filter($paths, fn($v) => in_array($v, $names)); | $this->existingSchemaPaths = array_filter($paths, fn($v) => in_array($v, $names)); | ||
| $this->existingSchemaPaths = array_filter($paths, {$v => in_array($v, $names)}); | $this->existingSchemaPaths = array_filter($paths, {$v => in_array($v, $names)}); | ||
| - | $this->existingSchemaPaths = array_filter($paths, function($v) => in_array($v, $names)); | + | </PHP> |
| + | <PHP> | ||
| function complement_s1(callable $f) { | function complement_s1(callable $f) { | ||
| return fn(...$args) => !$f(...$args); | return fn(...$args) => !$f(...$args); | ||
| Line 78: | Line 72: | ||
| return {(...$args) => !$f(...$args)}; | return {(...$args) => !$f(...$args)}; | ||
| } | } | ||
| - | function complement_s3(callable $f) { | + | </PHP> |
| - | return function(...$args) => !$f(...$args); | + | <PHP> |
| - | } | + | |
| function reject_s1($collection, callable $function) { | function reject_s1($collection, callable $function) { | ||
| return filter($collection, fn($value, $key) => !$function($value, $key)); | return filter($collection, fn($value, $key) => !$function($value, $key)); | ||
| Line 88: | Line 80: | ||
| return filter($collection, {($value, $key) => !$function($value, $key)}); | return filter($collection, {($value, $key) => !$function($value, $key)}); | ||
| } | } | ||
| - | function reject_s3($collection, callable $function) { | + | </PHP> |
| - | return filter($collection, function($value, $key) => !$function($value, $key)); | + | <PHP> |
| - | } | + | |
| // not real code but typical of such | // not real code but typical of such | ||
| $result = Collection::from([1, 2]) | $result = Collection::from([1, 2]) | ||
| Line 99: | Line 89: | ||
| ->map({$v => $v * 2}) | ->map({$v => $v * 2}) | ||
| ->reduce({($tmp, $v) => $tmp + $v}, 0); | ->reduce({($tmp, $v) => $tmp + $v}, 0); | ||
| - | $result = Collection::from([1, 2]) | ||
| - | ->map(function($v) => $v * 2) | ||
| - | ->reduce(function($tmp, $v) => $tmp + $v, 0); | ||
| </PHP> | </PHP> | ||
| Line 121: | Line 108: | ||
| | | \ Parameter is passed by reference | | | \ Parameter is passed by reference | ||
| | \ Function returns by reference | | \ Function returns by reference | ||
| - | \ Variables bound from the outer-scope are bound by reference | ||
| - | | ||
| - | And in the last option: | ||
| - | |||
| - | &function &(&$x) => function_that_takes_ref_and_returns_ref($x, $y) } | ||
| - | ^ ^ ^ | ||
| - | | | \ Parameter is passed by reference | ||
| - | | \ Function returns by reference | ||
| \ Variables bound from the outer-scope are bound by reference | \ Variables bound from the outer-scope are bound by reference | ||
| Line 147: | Line 126: | ||
| $add2 = {$x => {$y => $x + $y}}; | $add2 = {$x => {$y => $x + $y}}; | ||
| - | |||
| - | $add2 = function($x) => function($y) => $x + $y; | ||
| </PHP> | </PHP> | ||
| ===== Vote ===== | ===== Vote ===== | ||
| - | <doodle title="Preference of Arrow Function Syntax for PHP 7.2" auth="levim voteType="single" closed="true"> | + | <doodle title="Preference of Arrow Function Syntax for PHP 7.2" auth="levim voteType="multi" closed="true"> |
| + | * Prefixed with fn | ||
| + | * Enclosed by curly-braces | ||
| + | * Reuse function | ||
| + | * No Preference / Other Preference | ||
| + | </doodle> | ||
| + | |||
| + | |||
| + | <doodle title="Practice vote for Preference of Arrow Function Syntax for PHP 7.2" auth="levim voteType="multi" closed="TRUE"> | ||
| * Prefixed with fn | * Prefixed with fn | ||
| * Enclosed by curly-braces | * Enclosed by curly-braces | ||
| * Reuse function | * Reuse function | ||
| - | * No Preference | + | * No Preference / Other Preference |
| </doodle> | </doodle> | ||
rfc/arrow_function_preference.txt · Last modified: 2017/09/22 13:28 (external edit)