tagged templates
let person = 'Mike';
let age = 28;
function myTag(strings, personExp, ageExp) {
let str0 = strings[0]; // "That "
let str1 = strings[1]; // " is a "
let str2 = strings[2]; // "."
let ageStr;
if (ageExp > 99){
ageStr = 'centenarian';
} else {
ageStr = 'youngster';
}
// We can even return a string built using a template literal
return `${str0}${personExp}${str1}${ageStr}${str2}`;
}
let output = myTag`That ${ person } is a ${ age }.`;
console.log(output);
// That Mike is a youngster.