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Second solution in Clear category for [old] Digit Stack by byte986
"use strict";
function digitStack(commands){
let stack = [];
let sum = 0;
commands.forEach((el, i, arr) => {
let [command, number] = el.split(" ");
switch(command){
case "PUSH":
stack.push(number*1);
break;
case "POP":
sum += stack.pop() || 0;
break;
case "PEEK":
sum += stack[stack.length-1] || 0;
break;
}
});
return sum;
}
var assert = require('assert');
if (!global.is_checking) {
assert.equal(digitStack(["PUSH 3", "POP", "POP", "PUSH 4", "PEEK",
"PUSH 9", "PUSH 0", "PEEK", "POP", "PUSH 1", "PEEK"]),
8, "Example");
assert.equal(digitStack(["POP", "POP"]), 0, "pop, pop, zero");
assert.equal(digitStack(["PUSH 9", "PUSH 9", "POP"]), 9, "Push the button");
assert.equal(digitStack([]), 0, "Nothing");
console.log("Coding complete? Click 'Check' to review your tests and earn cool rewards!");
}
Oct. 31, 2016
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