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Merge pull request #48530 from KoBeWi/FMR_reloaded

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Improve docs for filter map and reduce
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Rémi Verschelde 2021-05-07 14:37:48 +02:00 committed by GitHub
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1 changed files with 10 additions and 7 deletions
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17
doc/classes/Array.xml
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@ -264,7 +264,8 @@
<argument index="0" name="method" type="Callable">
</argument>
<description>
Calls the provided [Callable] for each element in array and removes all elements for which the method returned [code]false[/code].
Calls the provided [Callable] on each element in the array and returns a new array with the elements for which the method returned [code]true[/code].
The callable's method should take one [Variant] parameter (the current array element) and return a boolean value.
[codeblock]
func _ready():
print([1, 2, 3].filter(remove_1)) # Prints [2, 3].
@ -379,7 +380,8 @@
<argument index="0" name="method" type="Callable">
</argument>
<description>
Calls the provided [Callable] for each element in array and replaces them with return value of the method.
Calls the provided [Callable] for each element in the array and returns a new array filled with values returned by the method.
The callable's method should take one [Variant] parameter (the current array element) and can return any [Variant].
[codeblock]
func _ready():
print([1, 2, 3].map(negate)) # Prints [-1, -2, -3].
@ -510,14 +512,15 @@
<argument index="1" name="accum" type="Variant" default="null">
</argument>
<description>
Calls the provided [Callable] for each element in array and accumulates the result in [code]accum[/code]. The method for [Callable] takse two arguments: current value of [code]accum[/code] and the current array element. If [code]accum[/code] is [code]null[/code] (default value), the method will use first element from the array as initial value.
Calls the provided [Callable] for each element in array and accumulates the result in [code]accum[/code].
The callable's method takes two arguments: the current value of [code]accum[/code] and the current array element. If [code]accum[/code] is [code]null[/code] (default value), the iteration will start from the second element, with the first one used as initial value of [code]accum[/code].
[codeblock]
func _ready():
print([1, 2, 3].reduce(factorial, 1)) # Prints 6.
print([1, 2, 3].reduce(func(accum, number): return accum * number)) # Same as above, but using lambda function.
print([1, 2, 3].reduce(sum, 10)) # Prints 16.
print([1, 2, 3].reduce(func(accum, number): return accum + number, 10)) # Same as above, but using lambda function.
func factorial(accum, number):
return accum * number
func sum(accum, number):
return accum + number
[/codeblock]
</description>
</method>