count.js

"use strict";

var ensureString = require("../../object/validate-stringifiable-value");

module.exports = function (search) {
	var string = ensureString(this), count = 0, index = 0;

	search = ensureString(search);
	if (!search) throw new TypeError("Search string cannot be empty");
	while ((index = string.indexOf(search, index)) !== -1) {
		++count;
		index += search.length;
	}
	return count;
};