38 lines
1.0 KiB
JavaScript
38 lines
1.0 KiB
JavaScript
/**
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* Performs the flattening of a data row recursively
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*
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* @param {String} separator Separator to be used as the flattened field name
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* @returns {Object => Object} Flattened object
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*/
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function flatten({ objects = true, arrays = false, separator = '.' } = {}) {
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function step (obj, flatDataRow, currentPath) {
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Object.keys(obj).forEach((key) => {
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const newPath = currentPath ? `${currentPath}${separator}${key}` : key;
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const value = obj[key];
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if (objects
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&& typeof value === 'object'
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&& value !== null
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&& !Array.isArray(value)
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&& Object.prototype.toString.call(value.toJSON) !== '[object Function]'
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&& Object.keys(value).length) {
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step(value, flatDataRow, newPath);
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return;
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}
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if (arrays && Array.isArray(value)) {
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step(value, flatDataRow, newPath);
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return;
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}
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flatDataRow[newPath] = value;
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});
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return flatDataRow;
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}
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return dataRow => step(dataRow, {});
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}
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module.exports = flatten;
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