How to convert Array of object value into a number

Question

For example I have this Array:

 const arr = [
    {val1: '123', text: 'not a num', new:'123.34'},
    {val1: '123', text: 'not a number', new:'123.34'},
    {val1: '123', text: 'yahoo', new:'123.34'}
    ]

And I want to convert the keys val1 and new into a number,

so I created this function:

const convertToNumbers = (arr: Array<{ unknown }>, keys: Array<string>) => {
  return arr.map((val) => {
    keys.map((k) => {
      console.log(val[k]);
      return (val[k] = +val[k]);
    });
   
  });
};

Expected result should be like this:

   const result = [
        {val1: 123, text: 'not a num', new:123.34},
        {val1: 123, text: 'not a number', new:123.34},
        {val1: 123, text: 'yahoo', new:123.34}
        ]

The function will accept both an Array(first param is the Array itself and the second contains the key to be converted into number).

Is there a way to solve my problem?

Do you want to do this in-place, or return a new array with copies of the objects with the appropriate keys converted? — Jamiec
– Jamiec, Commented Sep 3, 2020 at 11:55
If you're not interested in the return value of .map() (keys.map((k) => ...)) then .map() is the wrong tool — Andreas
– Andreas, Commented Sep 3, 2020 at 11:57
Does this answer your question? Converting array of objects value into integer value — Always Helping
– Always Helping, Commented Sep 3, 2020 at 12:03

Nina Scholz · Accepted Answer · 2020-09-03 12:13:36Z

2

You could map new objects and convert wanted keys.

const 
    array = [{ val1: '1,234', text: 'not a num', new:'123.34' }, { val1: '123', text: 'not a number', new:'123.34' }, { val1: '123', text: 'yahoo', new:'123.34' }],
    keys = ['val1', 'new'],
    result = array.map(object => ({
        ...object,
        ...Object.fromEntries(keys.map(key => [key, +object[key].replace(/[^\d.]/g, '')]))
    }));

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

edited Sep 3, 2020 at 12:13

answered Sep 3, 2020 at 11:56

Nina Scholz

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3 Comments

ajbee Over a year ago

I'm trying to delete the comma as well with this method [key, +object[key].replace(/,/g, '')] but with no luck

ajbee Over a year ago

sorry I forgot to add in the example... For example 1,299 to 1299

Nina Scholz Over a year ago

you need a replacement of unwanted characters. please see edit.

Deepak Sharma · Accepted Answer · 2020-09-03 12:09:27Z

0

const arr = [
    {val1: '123', text: 'not a num', new:'123.34'},
    {val1: '123', text: 'not a number', new:'123.34'},
    {val1: '123', text: 'yahoo', new:'123.34'}
    ]
var text = "";
var i;
for (i = 0; i < arr.length; i++) {
  text += arr[i].val1;
}
document.getElementById("demo").innerHTML = text;

<p id="demo"></p>

answered Sep 3, 2020 at 12:09

Deepak Sharma

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