How to make a object with increasing number of keys dynamically

Question

I want to make a object with increasing number of keys ,for given number of items n e.g n=4 , so I want my object as obj {a1:" ",a2:" ",a3:" ",a4:" "} & my value should be "" empty string .

Why not just use an array instead? Something like: `let a = ["a1", "a2", "a3", "a4"]` — Pedro Corso, Mar 06 '19 at 18:07

score 2 · Answer 1 · answered Mar 06 '19 at 18:02

2

var obj = {}
for (var i=1; i<=4; i++) {
  obj['a' + i] = "" 
}

answered Mar 06 '19 at 18:02

gilamran

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score 2 · Answer 2 · answered Mar 06 '19 at 18:03

You could create a little function that simply loops and sets keys

function createObj(n = 4, keyPrefeix = 'a') {
  const obj = {};
  for (let i = 1; i <= n; i++) {
    obj[keyPrefeix + i] = '';
  }
  return obj;
}

console.log(createObj());
console.log(createObj(10, 'foo'));

How to make a object with increasing number of keys dynamically

2 Answers2