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.
41 lines
1.1 KiB
41 lines
1.1 KiB
3 years ago
|
var toInteger = require('./toInteger');
|
||
|
|
|
||
|
|
/** Error message constants. */
|
||
|
|
var FUNC_ERROR_TEXT = 'Expected a function';
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Creates a function that invokes `func`, with the `this` binding and arguments
|
||
|
|
* of the created function, while it's called less than `n` times. Subsequent
|
||
|
|
* calls to the created function return the result of the last `func` invocation.
|
||
|
|
*
|
||
|
|
* @static
|
||
|
|
* @memberOf _
|
||
|
|
* @since 3.0.0
|
||
|
|
* @category Function
|
||
|
|
* @param {number} n The number of calls at which `func` is no longer invoked.
|
||
|
|
* @param {Function} func The function to restrict.
|
||
|
|
* @returns {Function} Returns the new restricted function.
|
||
|
|
* @example
|
||
|
|
*
|
||
|
|
* jQuery(element).on('click', _.before(5, addContactToList));
|
||
|
|
* // => Allows adding up to 4 contacts to the list.
|
||
|
|
*/
|
||
|
|
function before(n, func) {
|
||
|
|
var result;
|
||
|
|
if (typeof func != 'function') {
|
||
|
|
throw new TypeError(FUNC_ERROR_TEXT);
|
||
|
|
}
|
||
|
|
n = toInteger(n);
|
||
|
|
return function() {
|
||
|
|
if (--n > 0) {
|
||
|
|
result = func.apply(this, arguments);
|
||
|
|
}
|
||
|
|
if (n <= 1) {
|
||
|
|
func = undefined;
|
||
|
|
}
|
||
|
|
return result;
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = before;
|