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export default class ArrayExtension {
private readonly property: string;
private readonly body: <T>(this: Array<T>) => any;
constructor(property: string, body: <T>(this: Array<T>) => any) {
this.property = property;
this.body = body;
}
assign() {
// eslint-disable-next-line no-extend-native
Object.defineProperty(Array.prototype, this.property, {
value: this.body,
enumerable: false,
});
}
}
/**
* IMPORTANT: Any extension you add here *must* have a corresponding type definition
* in the Array<T> interface in ./General/ExtensionsTypings.ts. Otherwise,
* Typescript will not recognize your new function.
*/
const extensions = [
new ArrayExtension('lastElement', function () {
if (!this.length) {
return undefined;
}
return this[this.length - 1];
}),
];
function Assign() {
extensions.forEach(extension => extension.assign());
}
export { Assign };
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