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// Using the web crypto API is a quick way to get a pseudo-random number.
// It's is experimental in IE11 and namespaced behind a prefix.
var crypto = window.crypto || window.msCrypto;
// Generates a uuidv4-compliant string
// credit: https://gist.github.com/jed/982883
function uuidv4() {
return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
(
c ^
(crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))
).toString(16)
);
}
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