Insert a property before another object literal property, while maintaining all references to that object

1-simple.js

function insert(obj, {before, property, value}) {
	let found, temp = {};
	
	// Delete all properties from before onwoards and save them in temp
	for (let p in obj) {
		if (p === before) {
			found = true;
		}

		if (found) {
			temp[p] = obj[p];
			delete obj[p];
		}
	}
	
	// Add new property
	obj[property] = value;
	
	// Re-add removed properties
	for (let p in temp) {
		obj[p] = temp[p];
	}
}

2-assign.js

function insert(obj, {before, property, value}) {
	let found, temp = {};
	
	// Delete all properties from before onwoards and save them in temp
	for (let p in obj) {
		if (p === before) {
			found = true;
		}

		if (found) {
			temp[p] = obj[p];
			delete obj[p];
		}
	}
	
	// Add new property and re-add removed properties
	Object.assign(obj, {property: value, ...temp});
}

3-from-entries.js

function insert(obj, {before, property, value}) {
	// Create a copy of entries and add the new property in place
	let entries = Object.entries(obj);
	let i = entries.findIndex(a => a[0] === before);
	entries.splice(i, 0, [property, value]);

	// Delete all obj properties
	for (let p in obj) {
		delete obj[p];
	}

	// Re-add with the new one
	Object.assign(obj, Object.fromEntries(entries));
}

@monfera many thanks. I'd rather avoid pulling up d3 as a dep, I'll pilfer^Wstudy https://github.com/d3/d3-scale/blob/master/src/log.js for inspiration :-)

@pygy rolling your own code not fundamentally difficult, but finding the somewhat optimal set of tick values (so they're nice round numbers, and not too many ticks and not to few) and scale nicing etc. can get labor intensive, has edge cases too. Btw. there's no need to import the entirety of D3; it's enough to import d3-scale, although the last time I checked, one still ends up with color palette arrays etc. which you wouldn't use. Therefore even d3-scale is very large if you need it for just one cartesian scale. Not sure if Svelte-style JS treeshaking can get rid of the palettes etc. now, I think, worth a try, interested if you do that.