JavaScript For Loop

Key Value Pairs

Associative Arrays use { } as opposed to the normal [ ]

  var arr = { "one": 1, "two": 2, "three": 3 }; 

  //to get values
for (let value of Object.values(arr)) {
    alert(value);
}
//Output: 1, 2, 3

//to get keys
for (let value of Object.values(arr)) {
    alert(value);
}
//Output: one, two, three

Flintstones Json

  // Use a For-In Loop equine1
  const equine1 = { horse: '🐴', zebra: '🦓', unicorn: '🦄'}
  
  for (const key in equine1) {
      // Filters out properties inherited from prototype, see https://palantir.github.io/tslint/rules/forin/
      if (equine1.hasOwnProperty(key)) {
          console.log(equine[key]);
      }
  }
  
  // Unwrap the the Values
  
  for (const val of Object.values(equine1)) {
      console.log(val);
  }
  
  // Create a Map equine1
  const equine2 = new Map(Object.entries(equine));
  
  for (const v of equine1.values()) {
      console.log(v)
  }

Scooby-Doo For Loop

  let names = ['Scooby-Doo', 'Shaggy Rogers', 'Fred Jones', 'Daphne Blake', 'Velma Dinkley'];

  let numNames = names.length;
  
  
  //initialize;  test; increment
  
  for (let i = 0; i < numNames; i++) {
    console.log(names[i]);
  }

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