# omitBy
> Return a partial object copy excluding properties for which a predicate (function) returns a truthy value.
## Usage
```javascript
var omitBy = require( '@stdlib/utils/omit-by' );
```
#### omitBy( obj, predicate )
Returns a partial object copy excluding properties for which a `predicate` returns a truthy value.
```javascript
function predicate( key, value ) {
return ( value > 1 );
}
var obj1 = {
'a': 1,
'b': 2,
'c': 3
};
var obj2 = omitBy( obj1, predicate );
// returns { 'a': 1 }
```
## Notes
- The function returns a **shallow** copy.
- The function **only** copies **own** properties. Hence, the function never copies inherited properties.
## Examples
```javascript
var omitBy = require( '@stdlib/utils/omit-by' );
function predicate( key, value ) {
return ( typeof value === 'number' );
}
var obj1 = {
'a': '1',
'b': 2,
'c': NaN,
'd': null
};
var obj2 = omitBy( obj1, predicate );
// returns { 'a': '1', 'd': null }
```