Undefined safe way of extracting object properties
npm install undefsafeSimple function for retrieving deep object properties without getting "Cannot read property 'X' of undefined"
Can also be used to safely set deep values.
``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
`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
`
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'));