primrose/src/arrayRemoveAt.js

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/**
 * Removes an item at the given index from an array.
 * @param {any[]} arr
 * @param {number} idx
 * @returns {any} - the item that was removed.
 */
export function arrayRemoveAt(arr, idx) {
    if (!(arr instanceof Array)) {
        throw new Error("Must provide an array as the first parameter.");
    }
    return arr.splice(idx, 1);
}