How to write it better way e.g. lodash

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I want to check every child on way in array can i write it better with e.g. lodash

test[1] && test[1][2] && test[1][2][3] && doSomething

There are 3 common ways to get/check paths with lodash:

  1. _.get - which would attempt to get the value based on path and provide default if that value is not found

  2. _.has - which would give you boolean result if the path is found or not _.hasIn - which is like has but also would check if path is a direct or inherited property of object

  3. _.result - which would walk the path and execute any function among the way to get to the value or work as _.get otherwise (no functions present)

var data = [
        [],
        [
          [],
          [
           'hello',
	   function(){ return 'foo'}
          ]
        ]
    ];
		
console.log('get:', _.get(data, '1.1.0'))
console.log('has:', _.has(data, '1.1.0'))

console.log('result:', _.result(data, '1.1.0'))
console.log('result:', _.result(data, '1.1.1'))
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>

template function, Example. _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);. // => [1.2] of _.before ; this method creates a function that invokes func once it's called n or more times. 5 Tips to Write Better Conditionals in JavaScript. // Include lodash library, you will get _ function test There's always more than 1 way to achieve the same


You could check with _.has(object, path)

Checks if path is a direct property of object.

_.has(test, '[1][2][3]') && doSomething;

or

_.has(test, [1, 2, 3]) && doSomething;

If you like to get the value, then take _.get(object, path, [default])

var test = [
        [],
        [
            [],
            [],
            [
                [], [], [], 42
            ]
        ]
    ];

console.log(test[1][2][3]);
console.log(_.has(test, '[1][2][3]'));
console.log(_.has(test, [1, 2, 3]));

console.log(_.has(test, '[1][2][30]'));
console.log(_.has(test, [1, 2, 30]));

console.log(_.get(test, '[1][2][3]'));
console.log(_.get(test, [1, 2, 3]));

console.log(_.get(test, '[1][2][30]'));
console.log(_.get(test, [1, 2, 30]));
.as-console-wrapper { max-height: 100% !important; top: 0; }
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>

Lodash, var _ = require('lodash/core');. // Load the FP build for immutable auto-curried iteratee-first data-last methods. var fp = require('lodash/fp');. // Load method  _.differenceBy(array, [values], [iteratee=_.identity]) source npm package. This method is like _.difference except that it accepts iteratee which is invoked for each element of array and values to generate the criterion by which they're compared.


with _.get you can get value in path or return default value:

_.get(test, [1, 2, 3], doSomething);

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10 Lodash functions everyone should know, In short, Lodash is a JS helper library for arrays, strings and objects. In this example, the function validateEmail will be invoked after 500ms so With _.get, if the path doesn't exist, it will return undefined instead of an error. If you want better performance you should sort your array and using functions  Start practicing better writing by ditching the nonsense. Assert your points as clearly as possible and avoid qualifying words—like rather, very, and little—that suck the life out of your sentences. Mark Twain even suggested substituting “damn every time you’re inclined to write very,” to ensure your writing only includes what’s needed.


Lodash, There are many ways available to do the same task, all we are looking for is Here in the above example, on trying to read the property y of Follow me on Medium or Twitter to read more about JavaScript and libraries! According to our grammar rules, when this term is abbreviated, it is always written with periods between and after the letters: i.e., and it should always be followed by a comma, and then the remainder of the sentence. It often acts as a conjunction, linking two separate phrases or ideas together.