is string undefined null or empty c 23 javascript

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Alejandra
15 Oct 2016
1/**
2  * Checks the string if undefined, null, not typeof string, empty or space(s)
3  * @param {any} str string to be evaluated
4  * @returns {boolean} the evaluated result
5*/
6function isStringNullOrWhiteSpace(str) {
7    return str === undefined || str === null
8                             || typeof str !== 'string'
9                             || str.match(/^ *$/) !== null;
10}
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