I would like to check if any object is missing in complex object chain. I've come up with following solution, is there a better way accomplish the same?
var lg = console.log;
var t = { a:{a1: 33, a12:{ aa1d: 444, cc:3 } }, b:00};
var isDefined = function(topObj, propertyPath) {
if (typeof topObj !== 'object') {
throw new Error('First argument must be of type \'object\'!');
}
if (typeof propertyPath === 'string') {
throw new Error('Second argument must be of type \'string\'!');
}
var props = propertyPath.split('.');
for(var i=0; i< props.length; i++) {
var prp = props[i];
lg('checking property: ' + prp);
if (typeof topObj[prp] === 'undefined') {
lg(prp + ' undefined!');
return false;
} else {
topObj = topObj[prp];
}
}
return true;
}
isDefined(t, 'a.a12.cc');
You could define your function more simply like this:
var isDefined = function(value, path) {
path.split('.').forEach(function(key) { value = value && value[key]; });
return (typeof value != 'undefined' && value !== null);
};
Working example on jsfiddle.
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