@hackplan/polaris/esnext/utilities/get.js

Shopify’s product component library

const OBJECT_NOTATION_MATCHER = /\[(.*?)\]|(\w+)/g;
export function get(obj, keypath, defaultValue) {
    if (obj == null)
        return undefined;
    const keys = Array.isArray(keypath) ? keypath : getKeypath(keypath);
    let acc = obj;
    for (let i = 0; i < keys.length; i++) {
        const val = acc[keys[i]];
        if (val === undefined)
            return defaultValue;
        acc = val;
    }
    return acc;
}
function getKeypath(str) {
    const path = [];
    let result;
    while ((result = OBJECT_NOTATION_MATCHER.exec(str))) {
        const [, first, second] = result;
        path.push(first || second);
    }
    return path;
}