shift vs clear

let l = []
let counter;

function setup() {
  counter = 0

  for (var i = 0; i < 10000; ++i) {
    l.push(() => counter += 1)
  }
}

setup()

console.time('shift')
while (l.length) l.shift()()
console.timeEnd('shift')

console.log(l, counter)

setup()

console.time('clear')
for (var i = 0, len = l.length; i < len; ++i)
  l[i]()

l = []
console.timeEnd('clear')

console.log(l, counter)