These are some code snippets on how to create functions to check if a number is even. Do a factorial with a for loop. Do a text replacement with regular expressions.
// isEven f(x) function isEven(arg) { return arg%2 === 0 } // factorial f(x) function factorial(num) { var result = 1; for(var i = 2; i <= num; i++) { result = result * i; } return result; } // kebabToSnake() Replace a string "-" with '_'s function kebabToSnake(str) { var newStr = str.replace(/-/g , "_"); return newStr; }