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1. Use deconstruction to achieve the exchange of values of two variables
let a = 1;
let b = 2;
[a,b] = [b,a];
2. Using array derivation, calculate the square of each element of the array [1,2,3,4] and form a new array.
var arr1 = [1, 2, 3, 4];
var arr2 = [for (i of arr1) i * i];
console.log(arr2);
3. Use ES6 to modify the following template
let iam = "我是";
let name = "王德发";
let str = "大家好，"+iam+name+",多指教。";
change:
let iam = `我是`;
let name = `王德发`;
let str = `大家好，${
iam+name},多指教。`;
4. Use the following two methods to output 0 to 9 in sequence?
var funcs = []
for (var i = 0; i < 10; i++) {
funcs.push(function() {
console.log(i) })
}
funcs.forEach(function(func) {
func()
})
Answer: Use the closure of es5 and let of es6 respectively
// ES5告诉我们可以利用闭包解决这个问题
var funcs = []
for (var i = 0; i < 10; i++) {
func.push((function(value) {
return function() {
console.log(value)
}
}(i)))
}
// es6
for (let i = 0; i < 10; i++) {
func.push(function() {
console.log(i)
})
}