kenvantruong
6/3/2018 - 3:21 AM

Comparison

const original = 'chris';
    const clone    = 'CHRIS';

    console.groupCollapsed('String');
      console.log(original == 'chris'); // true
      console.log(original == clone); // false
      console.log(original == clone.toLowerCase()); // true
    console.groupEnd();

    const num1 = 10;
    const num2 = '10';

    console.groupCollapsed('Numbers');
      console.log(num1 == num2); // true 
      console.log(num1 === num2); // false
      console.log(num1 != num2); // false
      console.log(num1 !== num2); // true
    console.groupEnd();

    let what; // undefined
    let thing = null; 

    console.groupCollapsed('Booleans');
      console.log(Boolean(what)); // false
      console.log(Boolean(thing)); // false
      console.log(Boolean(num1)); // true
      console.log(Boolean(num2)); // true
      console.log(Boolean({})); // true
      console.log(Boolean([])); // true
    console.groupEnd(); 

    const firstArr  = [1, 2, 3];
    const secondArr = [1, 2, 3];
    const firstObj  = { color: 'red' };
    const secondObj = { color: 'red' };

    console.groupCollapsed('Objects and Arrays');
      console.log(firstArr === secondArr);
      console.log(firstObj === secondObj);
    console.groupEnd();

    console.group('And Or');
      console.log(Boolean('blah') && Boolean('thing')); // true
      console.log(Boolean('blah') && Boolean('')); // false
      console.log(Boolean('blah') || Boolean('')); // true
      console.log(Boolean('') || Boolean('')); // false
    console.groupEnd();