/
assignWithDepth.js
74 lines (73 loc) · 2.83 KB
/
assignWithDepth.js
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/**
* @function assignWithDepth Extends the functionality of {@link ObjectConstructor.assign} with the
* ability to merge arbitrary-depth objects For each key in src with path `k` (recursively)
* performs an Object.assign(dst[`k`], src[`k`]) with a slight change from the typical handling of
* undefined for dst[`k`]: instead of raising an error, dst[`k`] is auto-initialized to {} and
* effectively merged with src[`k`]<p> Additionally, dissimilar types will not clobber unless the
* config.clobber parameter === true. Example:
*
* ```js
* let config_0 = { foo: { bar: 'bar' }, bar: 'foo' };
* let config_1 = { foo: 'foo', bar: 'bar' };
* let result = assignWithDepth(config_0, config_1);
* console.log(result);
* //-> result: { foo: { bar: 'bar' }, bar: 'bar' }
* ```
*
* Traditional Object.assign would have clobbered foo in config_0 with foo in config_1. If src is a
* destructured array of objects and dst is not an array, assignWithDepth will apply each element
* of src to dst in order.
* @param dst
* @param src
* @param config
* @param dst
* @param src
* @param config
* @param dst
* @param src
* @param config
* @param {any} dst - The destination of the merge
* @param {any} src - The source object(s) to merge into destination
* @param {{ depth: number; clobber: boolean }} [config={ depth: 2, clobber: false }] - Depth: depth
* to traverse within src and dst for merging - clobber: should dissimilar types clobber (default:
* { depth: 2, clobber: false }). Default is `{ depth: 2, clobber: false }`
* @returns {any}
*/
const assignWithDepth = function (dst, src, config) {
const { depth, clobber } = Object.assign({ depth: 2, clobber: false }, config);
if (Array.isArray(src) && !Array.isArray(dst)) {
src.forEach((s) => assignWithDepth(dst, s, config));
return dst;
} else if (Array.isArray(src) && Array.isArray(dst)) {
src.forEach((s) => {
if (dst.indexOf(s) === -1) {
dst.push(s);
}
});
return dst;
}
if (typeof dst === 'undefined' || depth <= 0) {
if (dst !== undefined && dst !== null && typeof dst === 'object' && typeof src === 'object') {
return Object.assign(dst, src);
} else {
return src;
}
}
if (typeof src !== 'undefined' && typeof dst === 'object' && typeof src === 'object') {
Object.keys(src).forEach((key) => {
if (
typeof src[key] === 'object' &&
(dst[key] === undefined || typeof dst[key] === 'object')
) {
if (dst[key] === undefined) {
dst[key] = Array.isArray(src[key]) ? [] : {};
}
dst[key] = assignWithDepth(dst[key], src[key], { depth: depth - 1, clobber });
} else if (clobber || (typeof dst[key] !== 'object' && typeof src[key] !== 'object')) {
dst[key] = src[key];
}
});
}
return dst;
};
export default assignWithDepth;