You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
33 lines
635 B
33 lines
635 B
10 years ago
|
/**
|
||
|
|
* Safe chained function
|
||
|
|
*
|
||
|
|
* Will only create a new function if needed,
|
||
|
|
* otherwise will pass back existing functions or null.
|
||
|
|
*
|
||
|
|
* @param {function} one
|
||
|
|
* @param {function} two
|
||
|
|
* @returns {function|null}
|
||
|
|
*/
|
||
|
|
"use strict";
|
||
|
|
|
||
|
|
function createChainedFunction(one, two) {
|
||
|
|
var hasOne = typeof one === "function";
|
||
|
|
var hasTwo = typeof two === "function";
|
||
|
|
|
||
|
|
if (!hasOne && !hasTwo) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
if (!hasOne) {
|
||
|
|
return two;
|
||
|
|
}
|
||
|
|
if (!hasTwo) {
|
||
|
|
return one;
|
||
|
|
}
|
||
|
|
|
||
|
|
return function chainedFunction() {
|
||
|
|
one.apply(this, arguments);
|
||
|
|
two.apply(this, arguments);
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = createChainedFunction;
|