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Optimize op-assignment statement.

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Stephen Chung
2020-05-25 20:14:31 +08:00
parent fca140ef55
commit 95e67c48bd
11 changed files with 341 additions and 234 deletions
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README.md
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@@ -1388,19 +1388,19 @@ record == "Bob X. Davis: age 42 ❤\n";
The following standard methods (defined in the [`MoreStringPackage`](#packages) but excluded if using a [raw `Engine`]) operate on strings:
| Function | Parameter(s) | Description |
| ------------ | ------------------------------------------------------------ | ------------------------------------------------------------------------------------------------- |
| `len` | _none_ | returns the number of characters (not number of bytes) in the string |
| `pad` | character to pad, target length | pads the string with an character to at least a specified length |
| `append` | character/string to append | Adds a character or a string to the end of another string |
| `clear` | _none_ | empties the string |
| `truncate` | target length | cuts off the string at exactly a specified number of characters |
| `contains` | character/sub-string to search for | checks if a certain character or sub-string occurs in the string |
| `index_of` | character/sub-string to search for, start index _(optional)_ | returns the index that a certain character or sub-string occurs in the string, or -1 if not found |
| `sub_string` | start index, length _(optional)_ | extracts a sub-string (to the end of the string if length is not specified) |
| `crop` | start index, length _(optional)_ | retains only a portion of the string (to the end of the string if length is not specified) |
| `replace` | target character/sub-string, replacement character/string | replaces a sub-string with another |
| `trim` | _none_ | trims the string of whitespace at the beginning and end |
| Function | Parameter(s) | Description |
| ----------------------- | ------------------------------------------------------------ | ------------------------------------------------------------------------------------------------- |
| `len` | _none_ | returns the number of characters (not number of bytes) in the string |
| `pad` | character to pad, target length | pads the string with an character to at least a specified length |
| `+=` operator, `append` | character/string to append | Adds a character or a string to the end of another string |
| `clear` | _none_ | empties the string |
| `truncate` | target length | cuts off the string at exactly a specified number of characters |
| `contains` | character/sub-string to search for | checks if a certain character or sub-string occurs in the string |
| `index_of` | character/sub-string to search for, start index _(optional)_ | returns the index that a certain character or sub-string occurs in the string, or -1 if not found |
| `sub_string` | start index, length _(optional)_ | extracts a sub-string (to the end of the string if length is not specified) |
| `crop` | start index, length _(optional)_ | retains only a portion of the string (to the end of the string if length is not specified) |
| `replace` | target character/sub-string, replacement character/string | replaces a sub-string with another |
| `trim` | _none_ | trims the string of whitespace at the beginning and end |
### Examples
@@ -1463,19 +1463,19 @@ Arrays are disabled via the [`no_index`] feature.
The following methods (defined in the [`BasicArrayPackage`](#packages) but excluded if using a [raw `Engine`]) operate on arrays:
| Function | Parameter(s) | Description |
| ------------ | --------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------- |
| `push` | element to insert | inserts an element at the end |
| `append` | array to append | concatenates the second array to the end of the first |
| `+` operator | first array, second array | concatenates the first array with the second |
| `insert` | element to insert, position<br/>(beginning if <= 0, end if >= length) | insert an element at a certain index |
| `pop` | _none_ | removes the last element and returns it ([`()`] if empty) |
| `shift` | _none_ | removes the first element and returns it ([`()`] if empty) |
| `remove` | index | removes an element at a particular index and returns it, or returns [`()`] if the index is not valid |
| `len` | _none_ | returns the number of elements |
| `pad` | element to pad, target length | pads the array with an element to at least a specified length |
| `clear` | _none_ | empties the array |
| `truncate` | target length | cuts off the array at exactly a specified length (discarding all subsequent elements) |
| Function | Parameter(s) | Description |
| ----------------------- | --------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------- |
| `push` | element to insert | inserts an element at the end |
| `+=` operator, `append` | array to append | concatenates the second array to the end of the first |
| `+` operator | first array, second array | concatenates the first array with the second |
| `insert` | element to insert, position<br/>(beginning if <= 0, end if >= length) | insert an element at a certain index |
| `pop` | _none_ | removes the last element and returns it ([`()`] if empty) |
| `shift` | _none_ | removes the first element and returns it ([`()`] if empty) |
| `remove` | index | removes an element at a particular index and returns it, or returns [`()`] if the index is not valid |
| `len` | _none_ | returns the number of elements |
| `pad` | element to pad, target length | pads the array with an element to at least a specified length |
| `clear` | _none_ | empties the array |
| `truncate` | target length | cuts off the array at exactly a specified length (discarding all subsequent elements) |
### Examples
@@ -1585,16 +1585,16 @@ Object maps are disabled via the [`no_object`] feature.
The following methods (defined in the [`BasicMapPackage`](#packages) but excluded if using a [raw `Engine`]) operate on object maps:
| Function | Parameter(s) | Description |
| ------------ | ----------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------- |
| `has` | property name | does the object map contain a property of a particular name? |
| `len` | _none_ | returns the number of properties |
| `clear` | _none_ | empties the object map |
| `remove` | property name | removes a certain property and returns it ([`()`] if the property does not exist) |
| `mixin` | second object map | mixes in all the properties of the second object map to the first (values of properties with the same names replace the existing values) |
| `+` operator | first object map, second object map | merges the first object map with the second |
| `keys` | _none_ | returns an [array] of all the property names (in random order), not available under [`no_index`] |
| `values` | _none_ | returns an [array] of all the property values (in random order), not available under [`no_index`] |
| Function | Parameter(s) | Description |
| ---------------------- | ----------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------- |
| `has` | property name | does the object map contain a property of a particular name? |
| `len` | _none_ | returns the number of properties |
| `clear` | _none_ | empties the object map |
| `remove` | property name | removes a certain property and returns it ([`()`] if the property does not exist) |
| `+=` operator, `mixin` | second object map | mixes in all the properties of the second object map to the first (values of properties with the same names replace the existing values) |
| `+` operator | first object map, second object map | merges the first object map with the second |
| `keys` | _none_ | returns an [array] of all the property names (in random order), not available under [`no_index`] |
| `values` | _none_ | returns an [array] of all the property values (in random order), not available under [`no_index`] |
### Examples