You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
Pau aff9d08cee client 1 year ago
..
lib client 1 year ago
.jscsrc client 1 year ago
.jshintrc client 1 year ago
.npmignore client 1 year ago
.travis.yml client 1 year ago
LICENSE client 1 year ago
README.md client 1 year ago
example.js client 1 year ago
package.json client 1 year ago

README.md

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

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

Setting

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:

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'));