Sandbox::https://github.com/sibalonecoding-code/JavaScript/blob/master/String/CheckSnakeCase.js

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// CheckSnakeCase method checks the given string is in snake_case or not.

// Problem Source & Explanation: https://en.wikipedia.org/wiki/Naming_convention_(programming)

/**

* checkSnakeCase method returns true if the string in snake_case, else return the false.

* @param {String} varName the name of the variable to check.

* @returns `Boolean` return true if the string is in snake_case, else return false.

const checkSnakeCase = (varName) => {

// firstly, check that input is a string or not.

if (typeof varName !== 'string') {

throw new TypeError('Argument is not a string.')

}

const pat = /(.*?)_([a-zA-Z])*/

return pat.test(varName)

}

export { checkSnakeCase }