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}
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Object Key Order and Reflect.ownKeys

  1. const obj = { 11: 'eleven', 23: 'twenty-three', 1: 'one', 2: 'two', '-1': 'negative 1' };
  2.  
  3. console.log(Reflect.ownKeys(obj))

I noticed that for in.. over an object was giving me weirdly consistent results across all browsers the other day and stumbled upon this.

Great news, but it’s Reflect.ownKeys for me… now that IE11 is dying/dead.

Step Between Two Numbers

  1. const stepBetweenA = (min, max, steps) => 
  2.   Array(steps).fill(0).reduce((prev, curr, i) => {
  3.     prev.push(min + ((max - min) / (steps - 1)) * i)
  4.     return prev
  5.   }, [])
  6.  
  7.  
  8. const stepBetweenB = (min, max, steps) => {
  9.   steps -= 1
  10.   const diff = (max - min) / steps
  11.   const result = [min]
  12.   for (let i = 0; i < steps; i++) {
  13.     result.push(min += diff)
  14.   }
  15.   return result
  16. }
  17.  
  18. console.log('a', stepBetweenA(10, 110, 4))
  19. console.log('b', stepBetweenB(10, 110, 4))
  20.  
  21. const ITER = 10000
  22.  
  23. console.time('a')
  24. for (let i = 0; i < ITER; i++) {
  25.   stepBetweenA(10, 110, 4)
  26. }
  27. console.timeEnd('a')
  28.  
  29.   console.time('b')
  30. for (let i = 0; i < ITER; i++) {
  31.   stepBetweenB(10, 110, 4)
  32. }
  33. console.timeEnd('b')

Two messy implementations for stepping between two numbers… I am not sure it’s possible to make console.time work well with the snippet zone quick editor – so if you want to see the times… open your console.

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.

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.

Guess the semi-golf

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

Try and guess what would be logged here…

snippet.zone ~ 2021-22 /// {s/z}