Is there a condensed way to do this using Lodash? (or perhaps Vanilla JS/TypeScript)
var val = _.get(obj, 'value', '');Please note that var val = obj.value || ''; is not suitable as it considers 0 and false as valid but falsy values.
Thank you.
Using lodash allows you to utilize the _.get() function for retrieving values. The third parameter of this method serves as a default value that will be returned if the specified property is undefined:
var object = { anotherProperty: 'not default' };
var value = _.get(object, 'property', 'default');
var anotherValue = _.get(object, 'anotherProperty', 'default');
console.log('value:', value);
console.log('anotherValue:', anotherValue);<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>Utilizing destructuring in ES6 enables you to assign default values. Here is an example:
const {val = ''} = obj
When ES6 support is available, you have the option to utilize destructuring and default parameters, which are handled by the JS engine in an abstracted way.
function validate( {
value = ''
} = {}) {
// The default parameters are specified within the function signature
// This helps maintain a clean function body without needing to add extra code for default values
console.log('value: ' + value );
}
validate({ value: 100 }); // value: 100
validate({ value: 0 }); // value: 0
validate(); // value:
In this example, two patterns are being demonstrated
{
value = ''
} = {}
The value following the equals sign represents the default value expected for the object, while the nested curly braces denote the destructuring pattern being applied.
Using ES6 destructuring to assign a default value of an empty string if the value is undefined:
var {value: val=''} = obj;
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