10 examples of 'javascript check if object exists' in JavaScript

19
function objectKeyExist(object)
20
{
21
    return _.some(object, function (o) {
22
        return !_.isEmpty(_.pick(o, ['customer', 'cart']));
23
    })
24
}

148
export function hasObject(objectId:string):boolean {
149
  return _registeredObjects.hasOwnProperty(objectId) &&
150
    _registeredObjects[objectId] !== null;
151
}

194
function internalCheck(oObject) {
195
	if (oObject.__publicControl) {
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		return true;
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	}
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	if (!oObject) {
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		return false;
200
	}
201
	var oParent = oObject.getParent();
202
	if (!oParent) {
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		return false;
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	}
205
	if (oParent.__publicControl) {
206
		var aList = that.findAllPublicElements(oParent, oCore).filter(function(oSingleControl) {
207
			return oSingleControl.getId() === oControl.getId();
208
		});
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		return aList.length > 0;
210
	}
211
	return internalCheck(oParent);
212
}

17
function CheckExists(id) {
18
    var idName = "assets/" + id.toLowerCase();
19
    var idNoExt = idName.substring(0, idName.lastIndexOf("."));
20
    return allFiles.hasOwnProperty(idName) || allAssets.hasOwnProperty(idNoExt);
21
}

81
function valueExists(value: any) {
82
    return value != null;
83
}

11
function exists(val) { return val !== null && val !== undefined }

876
export function checkObject(object: EezObject): IMessage[] {
877
    if (isArray(object)) {
878
        const check = object._propertyInfo!.check;
879
        if (check) {
880
            return check(object);
881
        }
882
    } else {
883
        if ((object as any).check) {
884
            return (object as any).check();
885
        }
886
    }
887
    return [];
888
}

13
static checkFunctionsOfObject(object, functions) {
14
    functions.forEach(func => {
15
        assert.equal(!!object[func], true);
16
    });
17
}

1
function jsCheck(id)
2
{
3
 el=document.getElementById(id);
4
 el.checked='checked';
5
}

248
function exists(plc, isEndpoint) { //place, boolean indicator if this place will be the start or stop
249
    for(var i=0; i<wayPoint.length; i++) { //loop through waypoints
250
        if(wayPoint[i]['formatted_address'] == plc['formatted_address']) {
251
            alert("Address:\n" + "'" + wayPoint[i]['formatted_address'] + "'\nis already a waypoint!\n");
252
            return true;
253
           }
254
    }
255
    
256
    //check that the potential waypoint isn't the same as the start or end
257
    if(!isEndpoint && ((typeof start !='undefined' && start['formatted_address'] == plc['formatted_address']) || (typeof end !='undefined' && end['formatted_address'] == plc['formatted_address']))) {
258
        alert("Address:\n" + "'" + plc['formatted_address'] + "'\nis your start or end point!\n");
259
        return true;
260
    }
261
    return false; //working :D!
262
    
263
}