Check if a string is an integer in javascript

Small function in pure Javascript to check if a string is an integer or not.

function isInteger(value) {
    var intRegex = /^\d+$/;
    return intRegex.test(value);

isInteger(5);         // true
isInteger(undefined); // false
isInteger("1");       // true
isInteger("1.3");     // false
isInteger(".Maui")    // false

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