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