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// [1,1,2,2,3,4,4,5,5]

// Version using purely arrays:
// Complexity: LogO because I'm filtering the main array
// to find the repetitions, best scenario, we would need
// 1 iteration (scenario where the first element is the
// one that doesn't have any repetition)
function findRepeatedNumberV1(arr: number[]) {
  for(let i = 0; i < arr.length ; i ++) {
    const repetitions = arr.filter(num => num === arr[i])

brion25

<style>
  .bordered {
    border-top: dotted 1px var(--color);
    border-bottom: solid 2px var(--color);
  }

  #menu a.bordered {
    --color: #111;
  }

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.bordered {
  border-top: dotted 1px var(--color);
  border-bottom: solid 2px var(--color);
}

#menu a.bordered {
  --color: #111;
}

.post a.bordered {

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.bordered(@color) {
  border-top: dotted 1px @color;
  border-bottom: solid 2px @color;
}

#menu a {
  .bordered(#111);
}

.post a {

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:root {
    --width: 30px;
}

.container {
    width: var(--width, 100%);
}

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:root {
    --width: 30px;
}

.container {
    width: var(--width);
}

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--width: 10px;
--shadow: box-shadow: 10px 10px 5px 0px rgba(0,0,0,0.75);

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class FancyArray extends Array {
    multiply() {
        this.forEach(el => this.push(el * el))
    }
}

const a = new FancyArray(1,2,3,4,5)
a.multiply()
console.log(a)

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<my-component [(title)]="myAwesomeTitle"></my-component>
<!--
  This means that the 'title' variable is going to point to the variable 'myAwesomeTitle'
  if something changes the variable 'title' inside the component 'my-component', the change
  is going to be propagated until the variable 'myAwesomeTitle'
-->

<input [(ngModel)]="name" />
<!--
  This is an example of a two-way binding to an special directive. This directive is the one

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<p>{{myAwesomeText | uppercase}}</p>
<!--
  After the expression is evaluated, the value is going to be tranformed to uppercase
-->

<p>{{myAwesomeText?.fallbackValue}}</p>
<!--
  In case the variable 'myAwesomeText' is null or undefined, Angular will render the variable
  'fallbackValue' As a good practice, the 'fallbackValue' must not be null or undefined
-->