@cookbook/dot-notation/lib/pick.js

Object readings and complex transformations using dot notation syntax.

import getArrayIndex from './utils/get-array-index';
import getKey from './utils/get-key';
import is from './utils/is';
import shallowCopy from './utils/shallow-copy';
const pick = (source, path) => {
    if (is.nullish(path) || !path.toString().trim()) {
        throw new SyntaxError(`A dot notation path was expected, but instead got "${path}"`);
    }
    const content = shallowCopy(source);
    let [key, remainingPath] = getKey(path);
    const hasArrayNotation = getArrayIndex(key.toString());
    if (hasArrayNotation) {
        const { 1: idx } = hasArrayNotation;
        if (!idx) {
            throw new SyntaxError(`An array index was expected but nothing was found at "${path}"`);
        }
        if (Number.isNaN(+idx)) {
            throw new TypeError(`Array index must a positive integer "${idx}"`);
        }
        if (+idx < 0) {
            throw new RangeError(`Array index must be equal or greater than 0, but instead got "${idx}"`);
        }
        key = +idx;
    }
    if (!remainingPath || is.nullish(content[key])) {
        return content[key];
    }
    return pick(content[key], remainingPath);
};
export default pick;
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