You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
30 lines
692 B
JavaScript
30 lines
692 B
JavaScript
/**
|
|
* Returns the first parameter if not undefined, otherwise the second parameter.
|
|
* Useful for setting a default value for a parameter.
|
|
*
|
|
* @function
|
|
*
|
|
* @param {*} a
|
|
* @param {*} b
|
|
* @returns {*} Returns the first parameter if not undefined, otherwise the second parameter.
|
|
*
|
|
* @example
|
|
* param = Cesium.defaultValue(param, 'default');
|
|
*/
|
|
function defaultValue(a, b) {
|
|
if (a !== undefined && a !== null) {
|
|
return a;
|
|
}
|
|
return b;
|
|
}
|
|
|
|
/**
|
|
* A frozen empty object that can be used as the default value for options passed as
|
|
* an object literal.
|
|
* @type {Object}
|
|
* @memberof defaultValue
|
|
*/
|
|
defaultValue.EMPTY_OBJECT = Object.freeze({});
|
|
|
|
export default defaultValue;
|