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author | Minteck <contact@minteck.org> | 2022-06-04 08:51:01 +0200 |
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committer | Minteck <contact@minteck.org> | 2022-06-04 08:51:01 +0200 |
commit | 383285ecd5292bf9a825e05904955b937de84cc9 (patch) | |
tree | 0a53b6f02c1604b078044567c03dc1b6c944c8c2 /node_modules/undefsafe/README.md | |
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diff --git a/node_modules/undefsafe/README.md b/node_modules/undefsafe/README.md new file mode 100644 index 0000000..46a706b --- /dev/null +++ b/node_modules/undefsafe/README.md @@ -0,0 +1,63 @@ +# undefsafe + +Simple *function* for retrieving deep object properties without getting "Cannot read property 'X' of undefined" + +Can also be used to safely set deep values. + +## Usage + +```js +var object = { + a: { + b: { + c: 1, + d: [1,2,3], + e: 'remy' + } + } +}; + +console.log(undefsafe(object, 'a.b.e')); // "remy" +console.log(undefsafe(object, 'a.b.not.found')); // undefined +``` + +Demo: [https://jsbin.com/eroqame/3/edit?js,console](https://jsbin.com/eroqame/3/edit?js,console) + +## Setting + +```js +var object = { + a: { + b: [1,2,3] + } +}; + +// modified object +var res = undefsafe(object, 'a.b.0', 10); + +console.log(object); // { a: { b: [10, 2, 3] } } +console.log(res); // 1 - previous value +``` + +## Star rules in paths + +As of 1.2.0, `undefsafe` supports a `*` in the path if you want to search all of the properties (or array elements) for a particular element. + +The function will only return a single result, either the 3rd argument validation value, or the first positive match. For example, the following github data: + +```js +const githubData = { + commits: [{ + modified: [ + "one", + "two" + ] + }, /* ... */ ] + }; + +// first modified file found in the first commit +console.log(undefsafe(githubData, 'commits.*.modified.0')); + +// returns `two` or undefined if not found +console.log(undefsafe(githubData, 'commits.*.modified.*', 'two')); +``` |