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JavaScript: Get the native type of a value

JavaScript fundamental (ES6 Syntax): Exercise-220 with Solution

Write a JavaScript program to get the native type of a value. Returns the lowercased constructor name of value, "undefined" or "null" if value is undefined or null.

  • Return 'undefined' or 'null' if the value is undefined or null.
  • Otherwise, use Object.prototype.constructor.name to get the name of the constructor.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const getType = v =>
  v === undefined ? 'undefined' : v === null ? 'null' : v.constructor.name.toLowerCase();
console.log(getType(new Set([1, 2, 3])));

Sample Output:

set

Flowchart:

flowchart: Get the native type of a value.

Live Demo:

See the Pen javascript-basic-exercise-220-1 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

Randomizes the order of the values of an array, returning a new array

Example:

const tips_shuffle = ([...arr]) => {
  let x = arr.length;
  while (x) {
    const i = Math.floor(Math.random() * x--);
    [arr[x], arr[i]] = [arr[i], arr[x]];
  }
  return arr;
};
const foo = [2, 4, 6];
console.log(tips_shuffle(foo));

Output:

[4, 2, 6]

 

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