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A safe format function to read deeply nested properties (i.e. my.nested.value)... If any property in the chain is null or undefined, an empty string will be returned
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// | |
// Usage... for a nested structure | |
// var test = { | |
// nested: { | |
// value: 'Read Correctly' | |
// } | |
// }; | |
// safeRead(test, 'nested', 'value'); // returns 'Read Correctly' | |
// safeRead(test, 'missing', 'value'); // returns '' | |
// | |
var safeRead = function() { | |
var current, formatProperty, obj, prop, props, val, _i, _len; | |
obj = arguments[0], props = 2 <= arguments.length ? [].slice.call(arguments, 1) : []; | |
read = function(obj, prop) { | |
if ((obj != null ? obj[prop] : void 0) == null) { | |
return; | |
} | |
return obj[prop]; | |
}; | |
current = obj; | |
for (_i = 0, _len = props.length; _i < _len; _i++) { | |
prop = props[_i]; | |
if (val = read(current, prop)) { | |
current = val; | |
} else { | |
return ''; | |
} | |
} | |
return current; | |
}; |
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