1. const PALETTE = ["#5B8FF9", "#5AD8A6", "#F6BD16", "#E86452"];
    3. /**
    4.  * ==========================================================================
    5.  * @param startWithColor absent, or one of the colors in PALETTE
    6.  */
    7. function getColorGenerator(
    8.   startWithColor?: string
    9. ): Generator<string, string> {
    10.   // Your code goes here
    11.   let i = startWithColor ? PALETTE.indexOf(startWithColor) - 1 : -1;
    12.   return (function* fn() {
    13.     while (i < PALETTE.length) {
    14.       i++;
    15.       if (i === PALETTE.length) {
    16.         i = 0;
    17.       }
    18.       yield PALETTE[i];
    19.     }
    20.     return '';
    21.   })();
    22. }
    24. /**
    25.  * ==========================================================================
    26.  * Finish the function
    27.  * Expected console output:
    28.  * "#5B8FF9"
    29.  * "#5AD8A6"
    30.  * "#F6BD16"
    31.  * "#E86452"
    32.  */
    33. function main1() {
    34.   const colorGenerator = getColorGenerator();
    35.   for (let i = 0; i < 8; i++) {
    36.     if (i % 2 !== 0) {
    37.       continue;
    38.     }
    39.     // use colorGenerator to get color, and print it
    40.     // console.log(color)
    41.     const color = colorGenerator.next().value;
    42.     console.log(color);
    43.   }
    44. }
    45. main1();
    47. /**
    48.  * ==========================================================================
    49.  * Finish the function
    50.  * Expected console output:
    51.  * "#F6BD16"
    52.  * "#E86452"
    53.  * "#5B8FF9"
    54.  * "#5AD8A6"
    55.  */
    56. function main2() {
    57.   const colorGenerator = getColorGenerator("#F6BD16");
    58.   for (let i = 0; i < 4; i++) {
    59.     // use colorGenerator to get color, and print it
    60.     // console.log(color)
    61.     const color = colorGenerator.next().value;
    62.     console.log(color);
    63.   }
    64. }
    65. main2();