PyCharm script start buttons disappeared, what should I do?

Question

PyCharm

Why are there no buttons, they disappear on their own, why is this happening and how can I fix it?

Answer 1

View --> Appearance --> Navigation Bar

Answer 2

//var initialData = [1, 9, 4, 95, -3, 51, 6, 9, 4, 4,-9, 88, 27];
var initialData = [2, 2, 2, 2, 2, 2, 2, 2, 2, 2];

var wayFirst = function(data) { 
  var sum = 0;
  data.forEach( (value) => {sum = sum + value} )
  return sum;
}

var waySecond = function(data) {
  var sum = 0;
  data.forEach( (value, i) => {
    i % 2 === 0 ?  sum = sum + value : false
  })
  return sum;
}

var wayThird = function(data) {
  var sum = 0;
  var iTemp = 0
  data.forEach( (value, i) => { 
    if (!iTemp || iTemp + 4 === i)  { 
      sum = sum + value;
      iTemp === 0 ? iTemp = 1 : iTemp = i;
    } 
  })
  return sum;
}

console.log(wayFirst(initialData));
console.log(waySecond(initialData))
console.log(wayThird(initialData))

did through forEach but through reduce it would be a little more compact
or if you need to get not values ​​but summarized elements with an interval

const initialData = [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2]

let sumArrayWithInterval = (data, interval) => { 
  const sumWithIntervel = []; 
  let next = 0;
  data.forEach((value, i) => {
    if (next === i) { 
      const valueIndex = interval === 1 ? 1 + i : interval + 1 + i;
      
      data[valueIndex] ? sumWithIntervel.push(value + data[valueIndex]) : false
      interval === 1 ? next = i + interval + 1 : next = valueIndex + 1
    }
  })
  return sumWithIntervel;
}
console.log(
      sumArrayWithInterval(initialData, 1)
);

console.log( 
    sumArrayWithInterval(
      sumArrayWithInterval(initialData, 1)
    , 2)
);

console.log( 
  sumArrayWithInterval(
    sumArrayWithInterval(
      sumArrayWithInterval(initialData, 1)
    , 2)
  , 4)
);

Answer 3

I recommend doing this during the day.
You open the curtains of the window to make it brighter.
You can also turn on the light.
You take it, you pour out the whole array on the table.
You move some elements away from others with your fingers.
See to it that the elements are good.
Well, good ones right from the table you throw your finger into the pan.
But seriously, first formulate more clearly.

Answer 4

Help)

Put on a lifebuoy and paddle to shore.