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AboutAll PostsWarningRandom

Alphabet Array JavaScript

  1. const alphabet = 'abcdefghijklmnopqrstuvwxyz'.split('')
  2. console.log(alphabet);
  3. // outputs: ['a', 'b', 'c', ... 'z']

Create an array of the alphabet.

Splitting a string with an empty string results in each character being placed into a slot in the new array.

// arrays // javascript // strings // tricks

Merge Collection (array of objects)

  1. const collection = [
  2.   { name: 'Joe' },
  3.   { age: 31 },
  4.   { job: 'programmer' }
  5. ];
  6. const merged = Object.assign({}, ...collection);
  7. console.log(merged);

Combine (“assign”) entire array of objects.

Saw this here… figured it was worth a quick post.

// arrays // javascript // objects // tricks

Guess the semi-golf

  1. a=3217+'';a=[a];console.log(a[0][2])

Try and guess what would be logged here…

// arrays // codegolf // humor // javascript // strings

Array Range from 1

  1. Object.assign(Number.prototype, {
  2.   *[Symbol.iterator]() {
  3.     for (let i = this; i--;) 
  4.       yield this - i;
  5.   }
  6. });
  7.  
  8. console.log([...3]);

I saw this on twitter a little while back. Tweet was from James Padolsey. A fun trick, the thread is pretty entertaining.

// arrays // hacks // humor // javascript // tricks

Random Value From Array

  1. const modes = ['walk', 'run', 'hide', 'jump', 'dance'];
  2.  
  3. const randomMode = modes[Math.floor(modes.length * Math.random())];
  4.  
  5. console.log(randomMode);
  6.  
  7.  
  8. // turn it into a function:
  9. function randomChoice(arr) {
  10.   return arr[Math.floor(arr.length * Math.random())];
  11. }
  12.  
  13. const colors = ['red', 'green', 'blue', 'black', 'white']  ;
  14.  
  15. console.log(randomChoice(colors));
  16. console.log(randomChoice(modes));

Grab a random value from an array.

// arrays // javascript // tricks
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