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fix(observable-array): reduce no longer ignores zero as initial value (#6402)

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* fix(observable-array): reduce no longer ignores zero as initial value

* fix(observable-array): reduceRight now functions  properly when initial value is not specified or zero
This commit is contained in:
Nicu
2018-10-19 17:14:47 +03:00
committed by Alexander Vakrilov
parent a3f149325f
commit c0438df9a7
2 changed files with 32 additions and 4 deletions
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8
tns-core-modules/data/observable-array/observable-array.ts
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@ -1,4 +1,4 @@
import * as observable from "../observable";
import * as observable from "../observable";
import * as observableArrayDef from ".";
import * as types from "../../utils/types";
@ -314,7 +314,7 @@ export class ObservableArray<T> extends observable.Observable implements observa
* @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
*/
reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T, initialValue?: T): T {
return initialValue ? this._array.reduce(callbackfn, initialValue) : this._array.reduce(callbackfn);
return initialValue !== undefined ? this._array.reduce(callbackfn, initialValue) : this._array.reduce(callbackfn);
}
/**
@ -323,7 +323,7 @@ export class ObservableArray<T> extends observable.Observable implements observa
* @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
*/
reduceRight(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T, initialValue?: T): T {
return this._array.reduceRight(callbackfn, initialValue);
return initialValue !== undefined ? this._array.reduceRight(callbackfn, initialValue) : this._array.reduceRight(callbackfn);
}
}
@ -331,4 +331,4 @@ export interface ObservableArray<T> {
on(eventNames: string, callback: (data: observable.EventData) => void, thisArg?: any);
on(event: "change", callback: (args: observableArrayDef.ChangedData<T>) => void, thisArg?: any);
}
}