testvar[1] is the value of that array index, which is the number 2. Numbers don't have a length property, and you're checking for 2.length which is undefined. If you want the length of the array just check testvar.length

Mar 2, 2015 · Determining the length of an array is a fundamental operation in JavaScript. We will explore multiple approaches to find the length of an array. Please refer WebDevLearners for more details. Approach 1. Using length Property The most straightforward and commonly used method to find the length of an array is by accessing its length property ...

You can use forEach, if you want to keep the words, and the length you can do it like this:. var a = "Hello world" ; var chars = a.split(' '); var words = []; chars.forEach(function(str) { words.push([str, str.length]); });

Apr 19, 2012 · In your case you can simply use arr.length and arr[0].length to find the width and the depth. Often, the arrays will have variable depths which makes it necessary to iterate through the entire array using recursion. I created a prototype method of Object to get determine how deep the array is.

May 25, 2017 · we can you use .length property to set or returns number of elements in an array. return value is a number > set the length: let count = myArray.length; > return lengthof an array : myArray.length we can you .size in case we need to filter duplicate values and get the count of elements in a set.

First, there is no such thing as a JSON object. JSON is a string format that can be used as a representation of a Javascript object literal. Since JSON is a string, Javascript will treat it like a string, and not like an object (or array or whatever you are trying to use it as.) Here is a good JSON reference to clarify this difference:

Aug 13, 2018 · I need to get length of an array inside an array for my iteration. I have three arrays that contain names from three different majors in my college that nested in one array called 'jurusan' that means major in English. and I want to put all that names into three new groups that contain names from three different majors and put it inside each group.

Aug 8, 2008 · Run either Object.keys() to get an array that contains the names of only those properties that are enumerable or Object.getOwnPropertyNames() if you want to also include the names of properties that are not enumerable. Get the .length property of that array.

Dec 15, 2018 · I understand that finding the length of a JS object has been answered extensively here. With one of the suggested solutions being Object.keys(myObj).length. However, I'm struggling to find out how can I find the length of all properties contained on an array of objects. ie:

Jan 31, 2011 · When you call Array.apply with an array or an object with a length property Array is going to use the length to explicitly set each value of the new array. This is why Array(5) gives an array of 5 elisions, while Array.apply(null, Array(5)) gives an array of 5 undefined's.