public void sleep(long duration) {
    long start = System.currentTimeMillis();
    while(true) {
        if (System.currentTimeMillis() - start >= duration)
            break;
    }
}
By imaN NeO, 2018-10-28 09:35:15
let length str =
    let len = String.length str in
    
    let rec length_helper str curr = 
    if str = "" then 0 else 1 + length_helper (String.sub str 1 (len - curr - 1)) (curr + 1)
    
    in length_helper str 0;;

We use this code internally at Google. JFC.

By Mark, 2018-04-21 21:51:57


public static MyClass {
    private static volatile ProcessManager singleton = null;
    
    public static ProcessManager getInstance() throws Exception {
        if (singleton == null) {
            synchronized (MyClass.class) {
                if (singleton == null) {
                    singleton = new ProcessManager();
                }
            }
        }
        return singleton;
    }
}

The double-checking was invented prior to Java5.

The purpose is if the field isn't null, you don't have to synchronize. But since the java memory model specification was cleaned up and Synchronize/Volatile were given much better specification and semantics it is totally useless boilerplate that you should only write if you have to support Java4. There is a Google Tech Talk that covers this.

By cody, 2017-12-12 08:02:01
public static function getUser(){
    return \App\Models\User::all();
}
By mamadSiah, 2022-02-23 14:35:19
<div class="scrollContent">
	{foreach $animations as $index => $a}
		{if $index > 2}
			{if $a.filename == '9_1447691013_3726.png'}
			{else}
				{if $a.filename == '9_1423150010_6441.png'}
				{else}
					{if $a.filename == '9_1423149959_5909.png'}
					{else}
						{if $a.filename == '9_1423149908_5874.png'}
						{else}
							{if $a.filename == '9_1528213223_6374.jpg'}
							{else}
								{if $a.filename == '9_1527670984_3732.jpg'}
								{else}

							<div class="spotlightFrame frame{$index+1} contains1" data-index="{$index}">
								{if $a.link}<a href="{$a.link}">{/if}
								<img src="/upload/{$a.filename}" alt="{$a.title}" />
								{if $a.link}</a>{/if}
							</div>

								{/if}
							{/if}
						{/if}
					{/if}
				{/if}
			{/if}
		{/if}
	{/foreach}
</div>

Handovers are great.

By Anonymous, 2018-07-09 14:50:36
if(userEndDate.getTime() != null
    && userEndDate.getTime() > today.getTime()
    && endDateFromRequest != null ? endDateFromRequest.getTime() !== userEndDate.getTime() : true){
            
            //some code
     }

for code lovers :D

By Unnamed, 2018-11-30 16:12:08
const handleBoolean = value => {
        switch (value) {
            case "true":
                return true;
            case true:
                return "true";
            case "false":
                return false;
            case false:
                return "false"
            default:
                return null;
        }
    }
By Ifncn, 2022-01-27 07:49:16
public override List<Value> Values
{
    get 
    {
        if (_values == null && shouldLoadLazily)
        {
            _values = _lazerLoader.LoadValues<Value>()
        }
        
        return _values;
    }
    set 
    {
        throw new InvalidOperationException("Values are actually readonly- please set in constructor")
    }
}

How to create immutable fields in c#

By Unknown, 2017-12-12 14:42:38
 # 5-level loop, forgive me...
        for xi, xs in enumerate(X):
            for yi, ys in enumerate(Y):
                for zi, zs in enumerate(Z):
                    lx, ly, lz = len(xs), len(ys), len(zs)
                    # construct points
                    xx, yy, zz = custom_meshgrid(xs, ys, zs)
                    world_xyzs = (
                        torch.cat(
                            [xx.reshape(-1, 1), yy.reshape(-1, 1), zz.reshape(-1, 1)],
                            dim=-1,
                        )
                        .unsqueeze(0)
                        .to(count.device)
                    )  # [1, N, 3]

                    # cascading
                    for cas in range(self.cascade):
                        bound = min(2**cas, self.bound)
                        half_grid_size = bound / resolution
                        # scale to current cascade's resolution
                        cas_world_xyzs = world_xyzs * (bound - half_grid_size)

                        # split batch to avoid OOM
                        head = 0
                        while head < B:
                            tail = min(head + S, B)

                            # world2cam transform (poses is c2w, so we need to transpose it. Another transpose is needed for batched matmul, so the final form is without transpose.)
                            cam_xyzs = cas_world_xyzs - poses[
                                head:tail, :3, 3
                            ].unsqueeze(1)
                            cam_xyzs = cam_xyzs @ poses[head:tail, :3, :3]  # [S, N, 3]

                            # query if point is covered by any camera
                            mask_z = cam_xyzs[:, :, 2] > 0  # [S, N]
                            mask_x = (
                                torch.abs(cam_xyzs[:, :, 0])
                                < cx / fx * cam_xyzs[:, :, 2] + half_grid_size * 2
                            )
                            mask_y = (
                                torch.abs(cam_xyzs[:, :, 1])
                                < cy / fy * cam_xyzs[:, :, 2] + half_grid_size * 2
                            )
                            mask = (
                                (mask_z & mask_x & mask_y).sum(0).reshape(lx, ly, lz)
                            )  # [N] --> [lx, ly, lz]

                            # update count
                            count[
                                cas,
                                xi * S : xi * S + lx,
                                yi * S : yi * S + ly,
                                zi * S : zi * S + lz,
                            ] += mask
                            head += S
By Anonymous, 2022-05-13 14:03:28
<?php 
$k =1;
for($v = 0; $v < $nt; $v++) {         
	$bgClass= 'blueBg';
		if($k > 1 && $k%2 == 0){
			$bgClass= 'whiteBg';
		}
?> 
<tr  class="row_tr <?php echo $bgClass;?>">						
			<td class="row_td td_column_0">&nbsp;</td>					
			<td class="row_td column_1"><?php echo $rows[$v]['nothing'];?></td>
			...
			<td class="row_td td_column_0">&nbsp;</td>
	</tr>

<?php       
	$k++;
	}	
?>
By Unknown, 2018-02-13 14:47:19
		roots.push(resolver(Config.root, `${pageDir}${path.sep}${page}${path.sep}${page}.html`));
By Anonymous, 2023-04-01 10:39:37
/**
 * Stringify a JSON object
 * @param {*} value JSON value to stringify
 * @returns {string} stringify JSON
 */
function stringify(value) {
    var result = {};
    try {
        result = JSON.stringify(value);
    } catch (e) {
        Logger.error('Error while trying to stringify ' + e);
        result = JSON.stringify(result);
    }
    return result;
}

Stringify a JSON object

By Ihor Did, 2023-04-12 19:36:08
return [word for word in words if any(all(ch in row for ch in word.lower()) for row in rows)]

Filtering words that can be typed using only one row of the keyboard.

By Mark, 2019-02-27 15:53:46
    public function getProfilePicture(Company $company, $id, $url = null) {
        // @TODO: Figure out how to do this.
        return null;
    }
By Anonymous, 2019-04-12 15:16:30
boolean isUserAuthorized = user.isSuperAdmin();
if (!isUserAuthorized) {
    isUserAuthorized = isUserAdminOfEntity1();
}
if (!isUserAuthorized) {
    isUserAuthorized = isUserAdminOfEntity2();
}
if (!isUserAuthorized) {
    throw new AccessDeniedException("Authenticated user is not admin ");
}
By tralaladidou, 2019-05-07 16:37:32