when counting elements in JS - does the counting Objects sort it's keys?

Asked Apr 03 '19 at 06:41

Active Apr 03 '19 at 06:45

Viewed 29 times

I am using the following code to count elements in a string and store them in an Object.

    let count1 = {},
    count2 = {},

    for (n of str1) {
    count1[n] = (count1[n] || 0) + 1;
    }
    for (n of str2) {
    count2[n] = (count2[n] || 0) + 1;
    }

the result seems to be an object that sort itself without an explicit sort function (ie key-value pairs are accumulated in a sorted order and not the order in which they were added.)

is this always the case in JS?

asked Apr 03 '19 at 06:41

Yonatan Galili

Might depend on the implementation, but at least in Chrome, numeric keys always come first, sequentially. It's only non-numeric keys that will be listed in insertion order – CertainPerformance Apr 03 '19 at 06:44
1

^^ it is the actual standard. symbols are at the end. – Nina Scholz Apr 03 '19 at 06:45

when counting elements in JS - does the counting Objects sort it's keys?

0 Answers0