How can i get all index of array,
[
{
"name":"aloha",
"age":"18"
},
{
"name":"hello word"
},
{
"name":"John Doe",
"age":"28"
}
]
Output should be like [0,1,2]
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2Please refer this AlexC stackoverflow.com/help/how-to-ask. Consider trying something before asking question.manish kumar– manish kumar2019-05-10 09:54:57 +00:00Commented May 10, 2019 at 9:54
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every array index start form zero and end at the number one less than the length of array. what you want to ask, ask properlyFaiz Khan– Faiz Khan2019-05-10 09:57:05 +00:00Commented May 10, 2019 at 9:57
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3 Answers
Simplest way would be to (see this post):
let a = [{1: 'x'}, {1: 'y'}, {1: 'z'}]
let b = Array.from(a.keys())
console.log(b)and the naive solution is by calling map((_, i) => i)) on your array:
let a = [{1: 'x'}, {1: 'y'}, {1: 'z'}]
let b = a.map((_, i) => i)
console.log(b)
Comments
You can use Object.keys also to check keys index of any object.
let a = [
{
'name' : "aloha",
"age": "18"
},
{
"name": "hello word"
},
{
"name": "John Doe",
"age" : "28"
}]
console.log(Object.keys(a));Comments
You can use forEach loop, like this example:
//The array you want to get all the indexes from
const array = [{'a':1}, {'b':2}, {'c':3}];
//All indexes array
const indexArray = [];
array.forEach((el, i) => {
indexArray.push(i);
});
