javascript - access elements in array of strings that contain certain strings -      i have array can this: ["whatwp", "isvbz", "thedt", "temperaturenn", "inin", "bostonnn"]   i want access element containing in, if exists , next elements(s) until reach , including element nn in it. ,  bring together elements string.   when  seek access element containing in so, -1 there no element containing in.   here's how trying it:    strarr = ["whatwp", "isvbz", "thedt", "temperaturenn", "inin", "bostonnn"]; strarr[strarr.indexof('in')];    but undefined because  nil @ -1 exists.   how can access element of array of strings if contains in , every element after until matches element containing nn, including element? , joining string?        you need loop that:    var strarr = ["whatwp", "isvbz", "thedt", "temperaturenn", "i...