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basicCalculator.js
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basicCalculator.js
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var calculate = function (m) {
let stack = []
let number = ""
let operation = "+"
const s = m.split(" ").join("")
for (let i = 0; i < s.length; i++) {
if (s[i] >= 0 && s[i] <= 9) {
number += s[i]
}
if (s[i] ==="/" || s[i] ==="*" ||s[i] ==="+" ||s[i] ==="-" || i === s.length - 1) {
if (operation === "*") {
stack.push(parseInt(number) * parseInt(stack.pop()))
}
else if (operation === "/") {
stack.push(Math.trunc(parseInt(stack.pop())/ parseInt(number)))
}
else if (operation === "-") {
stack.push(parseInt(-number))
}
else if (operation === "+") {
stack.push(parseInt(number))
}
operation = s[i]
number = ""
}
}
var output = 0
while(stack.length){
output +=stack.pop()
}
return output
}