How to apply conditions based on array index?

Question

lets assume i have data now i want to check if index is there and process the logic based on that condition, what would be correct approach using ES6 to run below conditions ?

Any better way to achieve this task ?

main.ts

data = [
  {"obj1":"data"},
  {"obj2": "data"},

  ]

if(data[0].length) {
    // process logic 
}

if(data[1].length) {
    // process logic 
}

If its the same logic you can just use a foreach loop... or for of loop (or simple for/while loop) — chevybow, Oct 02 '18 at 17:45
Is this different logic in each case or should you do the same thing for each value that matches? Also, are you checking if the object has a `length` property or is that something else? — VLAZ, Oct 02 '18 at 17:45
@vlaz just want to check if response `data[0]` has object there then do the rest of the logic — hussain, Oct 02 '18 at 17:52
Possible duplicate of [How do I check in JavaScript if a value exists at a certain array index?](https://stackoverflow.com/questions/2672380/how-do-i-check-in-javascript-if-a-value-exists-at-a-certain-array-index) — Heretic Monkey, Oct 02 '18 at 17:57

score 0 · Answer 1 · answered Oct 02 '18 at 17:54

0

not really sure what exactly you want to do, but i think map/forEach work...

data = [
  {"obj1":"data"},
  {"obj2": "data"},

]
data.map((el, i) => { return i%2 == 0? Object.keys(el) : null })

answered Oct 02 '18 at 17:54

Charlie

183
2
14

score 0 · Answer 2 · answered Oct 02 '18 at 18:49

I think you want to check if the data array contains valid object type values and has some key->value pair in it. If so, do it in this way

for(let value of data){
  // may ignore few checks if required
  if(value && typeof(value) === 'object' && Object.keys(value).length){
    // value is valid and is object type with some value
    // write your logic here
  }
}

How to apply conditions based on array index?

2 Answers2