jquery if string starts with four letters code example

Example 1: javascript string starts with

//checks if a string starts with a word
function startsWith(str, word) {
    return str.lastIndexOf(word, 0) === 0;
}
startsWith("Welcome to earth.","Welcome"); //true

Example 2: javascript multiple startswith

//There is NO possibility to passing an Array
//like startsWith(["Mon" | "Tues"])
if (newStr4.startsWith("Mon") || newStr4.startsWith("Tues") || ...)

//although you can use regular expression,
//but performance are lower than the solution above
 if (newStr4.matches("(Mon|Tues|Wed|Thurs|Fri).*"))

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