[enter image description here][1] I have an object like this and I have to remove '_demo' in each item I tired below it did not work!

here is the image! [1]: https://i.stack.imgur.com/krIGK.png

datalist.forEach((data)=>{
    for(let da in data){
        da.replace('_demo','')
    }
})

CodePudding user response：

You can't change the name of an existing key, Either you delete the old key and create a new key with its value, or create a new object with the new key instead of the old key.

datalist = datalist.map(({ "test No_demo": test, ...data })=>{
    return {
       ...data,
       "test No": test
    }
})

CodePudding user response：

Since you can't directly alter an object's key: if the object key includes "_demo" create a new key, assign the value of the old object property to the new property defined by the new key, and then delete the old property.

const obj = {
  a_demo: 1,
  b: 2,
  c_demo: 3
};

for (const key in obj) {
  if (key.includes('_demo')) {
    const newKey = key.replace('_demo', '');
    obj[newKey] = obj[key];
    delete obj[key];
  }
}

console.log(obj);

CodePudding user response：

Using Object.keys to map each key and replace the _demo part.

let datalist = [
  {
    "Index": "312",
    "test No_demo": "skjhksdjhfsh",
    "Date created": "26/06/2018",
    "Updateddate_demo": "26/06/2018",
    "Address_demo": "testing"
  },
  {
    "Index": "312",
    "test No_demo": "skjhksdjhfsh",
    "Date created": "26/06/2018",
    "Updateddate_demo": "26/06/2018",
    "Address_demo": "testing"
  }
]

let res = datalist.map(row => {
  let x = {}
  Object.keys(row).map( k => {
    x[k.replace('_demo', '')] = row[k]
  });
  return x
});

console.log(res)