Rename js snippets

snippets/js/s/random-alphanumeric.md

@@ -0,0 +1,32 @@
+---
+title: Random alphanumeric string
+type: snippet
+language: javascript
+tags: [string,random]
+cover: gold-typewriter
+dateModified: 2020-10-22T20:24:04+03:00
+---
+
+Generates a random string with the specified length.
+
+- Use `Array.from()` to create a new array with the specified `length`.
+- Use `Math.random()` generate a random floating-point number.
+- Use `Number.prototype.toString()` with a `radix` value of `36` to convert it to an alphanumeric string.
+- Use `String.prototype.slice()` to remove the integral part and decimal point from each generated number.
+- Use `Array.prototype.some()` to repeat this process as many times as required, up to `length`, as it produces a variable-length string each time.
+- Finally, use `String.prototype.slice()` to trim down the generated string if it's longer than the given `length`.
+
+```js
+const randomAlphaNumeric = length => {
+  let s = '';
+  Array.from({ length }).some(() => {
+    s += Math.random().toString(36).slice(2);
+    return s.length >= length;
+  });
+  return s.slice(0, length);
+};
+```
+
+```js
+randomAlphaNumeric(5); // '0afad'
+```