Useful way to read JavaScript AND and OR expressions

and-or-operators-as-if-statements.js

// I find it useful to read expr1 && expr2 as "if expr1 is true, than expr2"
// By definition, expr1 && expr2 returns expr2 if expr1 can be converted to true; otherwise, it returns expr2. 
// Seeing things through an if statement helps me build this sort of mental shortcut.
function and(expr1, expr2) {
  if (Boolean(expr1) === true) {
    return expr2;
  }
  return expr1;
}

// I find it useful to read expr1 || expr2 as "if expr1 is true, then expr1"
// By definition, expr1 || expr2 returns expr1 if expr1 can be converted to true; otherwise, it returns expr2.
function or(expr1, expr2) {
  if (Boolean(expr1) === true) {
    return expr1;
  }
  return expr2;
}