Example 1: Generate Random Strings
// program to generate random strings
// declare all characters
const characters ='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
function generateString(length) {
let result = ' ';
const charactersLength = characters.length;
for ( let i = 0; i < length; i++ ) {
result += characters.charAt(Math.floor(Math.random() * charactersLength));
}
return result;
}
console.log(generateString(5));
Output
B5cgH
In the above example, the Math.random() method is used to generate random characters from the specified characters (A-Z, a-z, 0-9).
The for loop is used to loop through the number passed into the generateString() function. During each iteration, a random character is generated.
Example 2: Generate Random Strings Using Built-in Methods
// program to generate random strings
const result = Math.random().toString(36).substring(2,7);
console.log(result);
Output
gyjvo
In the above example, built-in methods are used to generate random characters.
The Math.random() method generates the random number between 0 and 1.
In toString(36) method, 36 represents base 36. The toString(36) represents digits beyond 9 by letters.
The substring(2, 7) method returns five characters.
Note: In the above examples, the output varies each time because random characters are generated at every execution.
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