How To Get Index Of Array Using JavaScript

Question

I have an array that isn't normal. Which can be accessed using index.

For example: I have an array and if I want to access it, I only need to use myArray[0] or myArray.name.

But, my array below is different:

[]
  name: Array(4)
        0 : {_id: "5b6bad0d7e9f754ff8aebd66", username: "tisufa", password: "12345"}
        1 : {_id: "5b6bad367e9f754ff8aebd67", username: "titus", password: "88888"}
        2 : {_id: "5b6c0f2c5978404d7431d589", username: "titus", password: "8888"}
        3 : {_id: "5b7103cdabcb573894cc1875", username: "nn", password: "22222"}

I tried to access myArray['name'] or myArray.name, but I can't do it.

I have tried to use:

for(let key in myArray){
     console.log(key);
}

but, I also can't access the key of the array. I got the information undefined

I beg for your help.

Thank you in advance.

Looks like a malformed array. Arrays shouldn't have name properties. Better to fix the code that generates it, so that you can then use standard array methods and index notation. — CertainPerformance
– CertainPerformance, Commented Aug 17, 2018 at 0:12

Jack Cole · Accepted Answer · 2018-08-17 00:19:40Z

1

myArray.name[0]

For some reason, you created an array and then created another array inside that array. I was able to reproduce what you did with this code:

let myArray = []
myArray['name'] = []

Find where you're doing this and fix it, or make your outer array an object:

let myArray = {} // This is an object
myArray['name'] = []

In both cases, you can access and loop through your array like so:

console.log(myArray.name) // print entire array
for(let i in myArray.name)
     console.log(myArray.name[i]) // print each element in array

answered Aug 17, 2018 at 0:19

Jack Cole

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1 Comment

Titus Sutio Fanpula Over a year ago

Thank you sir, for your response. I have tried it, but it still doesn't work.

FreshPeach · Accepted Answer · 2018-08-17 00:57:01Z

0

let arr_obj = [
    {_id: "5b6bad0d7e9f754ff8aebd66", username: "tisufa", password: "12345"},
    {_id: "5b6bad367e9f754ff8aebd67", username: "titus", password: "88888"},
    {_id: "5b6c0f2c5978404d7431d589", username: "titus", password: "8888"},
    {_id: "5b7103cdabcb573894cc1875", username: "nn", password: "22222"},
];

for(let [index,data] of arr_obj.entries()){
    console.log("index:",index,"data:",data);
}

ES6 for of and entries

enter image description here

answered Aug 17, 2018 at 0:57

FreshPeach

1

1 Comment

Titus Sutio Fanpula Over a year ago

Thank you sir, for your response. I have tried it, but it still doesn't work. Because myArray it's not look like that.

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