lesson_4.js

//JS NUggets: Template Literals

// multi-line strings
console.log(`string text line1
string text line2`)

// expression interpolation
var a = 5;
var b = 10;
console.log(`fifteen is ${a + b} and\nnot ${2 * a + b}.`)



// Tagged template literals
function tag(strings, ...value) {
    console.log(strings);
    console.log(value);

    return "JS Nuggets";

}


tag `Hello ${a + b} world ${a * b}`;
console.log(tag `Hello ${a + b} world ${a * b}`);

function template(strings, ...keys) {
    return (function(...values) {
        var dict = values[values.length - 1] || {};
        var result = [strings[0]];
        keys.forEach(function(key, i){
            var value = Number.isInteger(key) ? values[key] : dict[key];
            result.push(value, strings[i + 1]);
        });
        return result.join('');
    });
}

var t1Closure = template`${0}${1}${0}!`;
console.log(t1Closure('Y', 'A'));
var t2Closure = template`${0} ${'foo'}`;
console.log(t2Closure('Hello', {foo: 'World'}))