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Implement TypedArray#reduce/reduceRight (#352)

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This commit is contained in:
jtenner
2018-12-05 11:53:31 -05:00
committed by Daniel Wirtz
parent ced01216f8
commit d7f4874650
7 changed files with 5079 additions and 8 deletions
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27
std/assembly/internal/typedarray.ts
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@ -126,4 +126,31 @@ export abstract class TypedArray<T,TNative> {
return this;
}
}
/**
* TypedArray reduce implementation. This is a method that will be called from the parent,
* passing types down from the child class using the typed parameters TypedArrayType and
* ReturnType respectively. This implementation requires an initial value, and the direction.
* When direction is true, reduce will reduce from the right side.
*/
@inline
protected reduce_internal<TypedArrayType, ReturnType>(
callbackfn: (accumulator: ReturnType, value: T, index: i32, array: TypedArrayType) => ReturnType,
array: TypedArrayType,
initialValue: ReturnType,
direction: bool = false,
): ReturnType {
var index: i32 = direction ? this.length - 1 : 0;
var length: i32 = direction ? -1 : this.length;
while (index != length) {
initialValue = callbackfn(
initialValue,
this.__unchecked_get(index),
index,
array,
);
index = direction ? index - 1 : index + 1;
}
return initialValue;
}
}