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How do a foreach on an object with integer keys?


How do a foreach on an object with integer keys?

By : user2952869
Date : November 19 2020, 03:59 PM
may help you . I did this using a temporary table to sort key with SORT_NATURAL then foreach on it:
code :
$tmp=array();
foreach ($obj as $key=>$item) {
    $tmp[$key]=$item;
}
$tmp=(array_keys($tmp));
sort($tmp, SORT_NATURAL);
foreach ($tmp as $key) {
    $item=$obj->$key;
    /* ... my other code, with a good iteration ... */
}


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Does this Object.keys(o).forEach(...) iteration in node.js GC keys when it's done?

Does this Object.keys(o).forEach(...) iteration in node.js GC keys when it's done?


By : Nicoloss
Date : March 29 2020, 07:55 AM
Does that help Yes, the memory will be freed implicitly after the forEach has completed, as afterwards nothing on the stack will reference the array created by Object.keys any more. (There is no variable to nullify, btw)
You could've written equivalently
code :
{
    const keys = Object.keys(obj);
    keys.forEach(function(key) {
        const val = o[key];
        logic();
    });
}
Vanilla JavaScript - Object.keys(object).forEach display only the last item

Vanilla JavaScript - Object.keys(object).forEach display only the last item


By : Elie Massaad
Date : March 29 2020, 07:55 AM
To fix the issue you can do You're replacing the whole HTML content on each iteration. I assume you want to append each time. To do this use .insertAdjacentHTML() instead.
code :
Object.keys(nutrients).forEach(function(key) {
    const nutrientsList = nutrients[key];

    nutritionTable.insertAdjacentHTML(
        "beforeend",
        `<tr>
             <td>${[ nutrientsList.label ]}</td>
             <td>${[ nutrientsList.quantity ]} ${[ nutrientsList.unit ]}</td>
        </tr>`);
});
for (const nutrientsList of Object.values(nutrients)) {
    nutritionTable.insertAdjacentHTML(
        "beforeend",
        `<tr>
             <td>${[ nutrientsList.label ]}</td>
             <td>${[ nutrientsList.quantity ]} ${[ nutrientsList.unit ]}</td>
        </tr>`);
}
Why does the forEach() method exist for object keys but not array keys?

Why does the forEach() method exist for object keys but not array keys?


By : user3072569
Date : March 29 2020, 07:55 AM
To fix the issue you can do This is because Array.keys is NOT the same as Object.keys.
Array.keys return an iterator (or, really an "Array Iterator"), it doesn't expose any array prototype because it does not return an array, though it can be looped:
code :
for (var elem of Array(3).keys()){
	console.log(elem);
}

// If you really want to use forEach...
[...Array(3).keys()].forEach(k => console.log('spread syntax -> ', k));

// Or using Array.from
Array.from(Array(3).keys()).forEach(k => console.log('Array.from ->', k));
.forEach vs Object.keys().forEach performance on sparse arrays

.forEach vs Object.keys().forEach performance on sparse arrays


By : thineen
Date : March 29 2020, 07:55 AM
hope this fix your issue
as if because, in one case, a giant pointless loop from zero to length would be is executed, but not in the other case.
code :
function doNothing(){}
let perf;


console.log('Array with 50 million length and 1 non-empty element:');
const a = [];
a[49999999] = 'a';
console.log('a.length:', a.length);

perf = performance.now();
a.forEach(doNothing);
console.log('a:', performance.now() - perf);
console.log('');


console.log('Array with 0 length:');
const b = [];
b.foo = 'a';
console.log('b.length:', b.length);

perf = performance.now();
b.forEach(doNothing);
console.log('b:', performance.now() - perf);
console.log('');


console.log('Array with 50 million length and 0 non-empty element:');
const c = [];
c.length = 50000000;
console.log('c.length:', c.length);

perf = performance.now();
c.forEach(doNothing);
console.log('c:', performance.now() - perf);
How to remove spaces of object's keys? [for...in] [keys.forEach] [reduce]

How to remove spaces of object's keys? [for...in] [keys.forEach] [reduce]


By : Florian Kuehn
Date : March 29 2020, 07:55 AM
Does that help Questions like "what is better" are subjective and the answer is usually "whatever fits you the best as long as it does the trick". However, there's a common consensus that separating code into reusable parts is cleaner in the long run. In your particular example, "modify the keys of some object" and "remove whitespace" are two loosely related parts, which each can be useful on its own, so it's "better" to code them as such, for example:
code :
function mapKeys(obj, fn) {
    let res = {};

    for (let [k, v] of Object.entries(obj))
        res[fn(k)] = v;

    return res;
}
let removeSpaces = x => x.replace(/\s+/g, '');
newRecords = records.map(rec => mapKeys(rec, removeSpaces))
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