How to make all string in an object to uppercase in javascript

Question

For example I have an object:

{name:"Ken", address:"Sample", location:"Sample"}

How do I make the name, address and location in one code using javascript without using like name.toUpperCase().

You need to iterate over the properties of the object, and then update their values to uppercase. Tagging a duplicate of how to iterate over properties as you already know how to update them to uppercase. — Nisarg Shah, Mar 07 '19 at 07:17
Possible duplicate of [How do I loop through or enumerate a JavaScript object?](https://stackoverflow.com/questions/684672/how-do-i-loop-through-or-enumerate-a-javascript-object) — Nisarg Shah, Mar 07 '19 at 07:17

score 2 · Answer 1 · answered Mar 07 '19 at 07:24

You can use reduce() on the Object.keys. This method will not mutate the original object.

let obj = {name:"Ken", address:"Sample", location:"Sample"};
let result = Object.keys(obj).reduce((ac,k) => ({...ac,[k]:k.toUpperCase()}),{})
console.log(result)

score 1 · Answer 2 · answered Mar 07 '19 at 07:23

1

Use for...in and toUpperCase like so:

const data = {
  name: "Ken",
  address: "Sample",
  location: "Sample"
};

let upperCased = {};

for (var key in data) {
  upperCased[key] = data[key].toUpperCase();
}

console.log(upperCased);

answered Mar 07 '19 at 07:23

Jack Bashford

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score 0 · Answer 3 · answered Mar 07 '19 at 07:29

Why don't use a buildin method like toUpperCase() ?
If you dislike it you can wirtie your own method which check in a str every char, if it's value is in range 97-122 (a - z) then it subtract 32 transposing lowercase ASCII to uppercase ASCII (A - Z).
using buildin method seems more sane.

Here is a way to iterate trought dict and uppercase any of it's values

    $tmp = {name:"Ken", address:"Sample", location:"Sample"}
    $uppercase_tmp = {name: "", address: "", location: ""}

    $keys = Object.keys($uppercase_tmp);

    for($i = 0; $i < $keys.length; $i++) { 
        /* for each key in uppercase_tmp*/
        $uppercase_tmp[$keys[$i]] = $tmp[$keys[$i]].toUpperCase()
    }

Hoping it helps.
Hele

score 0 · Accepted Answer · answered Mar 07 '19 at 07:47

You could use a revival function of JSON.parse and then check the type and if a string, check if the character is in a ... z range, then subtract 32 from the character code to get an upper case letter.

const
    uc = c => c >= 'a' && c <= 'z'
        ? String.fromCharCode(c.charCodeAt() - 32)
        : c,
    toUpperCase = (key, value) => typeof value === 'string'
        ? Array.from(value, uc).join('')
        : value

var object = { name: "Ken", address: "Sample", location: "Sample" };

console.log(JSON.parse(JSON.stringify(object), toUpperCase));

How to make all string in an object to uppercase in javascript

4 Answers4