react-native-twopane-navigation/src/utilities/extensionMethods.ts

React Native package for dual screen devices navigation support (Surface Duo)

declare global {
    interface Array<T> {
        /**
    * Returns the last element from an array.
    */
        peek(): T;
    }
}

Array.prototype.peek = function () {
    if (this.length > 0) {
        return this[this.length - 1];
    }
    // empty array...
    return undefined;    // or another default value...
};


export {}