Javascript - 打印包含多个对象的数组中的所有名称

Question

所以我是 javascript 和编程的新手，我在下面有一组对象。我正在尝试生成并打印一个数组，其中包含所有获得 80 分或更高考试成绩的学生的全名（名字和姓氏用“”分隔）。有点像 ['James Johnson'、'Stephanie Ottesen'、'Leonard Arvan'、'Beverly Mott'、'Beatrice Jaco']。我已经创建了一个单独的数组，但是我无法弄清楚如何仅访问数组中的某些对象并将它们添加到我的新数组中。通过谷歌搜索，我遇到了 .map()、.reduce() 和 .filter() 方法，但我正在努力弄清楚如何采用这些方法并将它们格式化到我的程序中。任何帮助或参考将不胜感激。let students = [{fname: "Jane", lname: "Brazier", snum: "100366942", agrade: 67.59127376966494, tgrade: 64.86530868914188, egrade: 70.52944558104066}, {fname: "Ricardo", lname: "Allen", snum: "100345641", agrade: 65.80370345301014, tgrade: 75.40211705841241, egrade: 55.39348896202821}, {fname: "Mary", lname: "Hernandez", snum: "100221207", agrade: 71.20761408935981, tgrade: 71.37529197926764, egrade: 75.82038980457698}, {fname: "James", lname: "Johnson", snum: "100200842", agrade: 72.5791318299902, tgrade: 81.65883679807183, egrade: 85.19664228946989}, {fname: "Stephanie", lname: "Ottesen", snum: "100225067", agrade: 88.19738810849226, tgrade: 84.68339894849353, egrade: 82.23947265645927}, {fname: "Martin", lname: "Conway", snum: "100358379", agrade: 71.28759059295344, tgrade: 79.13194908266965, egrade: 77.61880623797336}, {fname: "Andrew", lname: "Weaver", snum: "100376243", agrade: 70.01798139244363, tgrade: 78.64811561086252, egrade: 78.68650242850617}, {fname: "Rhonda", lname: "Ford", snum: "100296902", agrade: 56.14580882764524, tgrade: 63.9209865108888, egrade: 60.186613967770334}, {fname: "Leonard", lname: "Arvan", snum: "100220616", agrade: 80.67865525396981, tgrade: 92.73557717342663, egrade: 88.32126970338336}, {fname: "William", lname: "Culler", snum: "100307637", agrade: let studentNames = [];

Answer 1

仅提取 80 级或更高的学生Array.filter。

使用 将剩余的学生映射为新格式Array.map。

结果：

let students = [{

  fname: "Jane",

  lname: "Brazier",

  snum: "100366942",

  agrade: 67.59127376966494,

  tgrade: 64.86530868914188,

  egrade: 70.52944558104066

}, {

  fname: "Ricardo",

  lname: "Allen",

  snum: "100345641",

  agrade: 65.80370345301014,

  tgrade: 75.40211705841241,

  egrade: 55.39348896202821

}, {

  fname: "Mary",

  lname: "Hernandez",

  snum: "100221207",

  agrade: 71.20761408935981,

  tgrade: 71.37529197926764,

  egrade: 75.82038980457698

}, {

  fname: "James",

  lname: "Johnson",

  snum: "100200842",

  agrade: 72.5791318299902,

  tgrade: 81.65883679807183,

  egrade: 85.19664228946989

}, {

  fname: "Stephanie",

  lname: "Ottesen",

  snum: "100225067",

  agrade: 88.19738810849226,

  tgrade: 84.68339894849353,

  egrade: 82.23947265645927

}, {

  fname: "Martin",

  lname: "Conway",

  snum: "100358379",

  agrade: 71.28759059295344,

  tgrade: 79.13194908266965,

  egrade: 77.61880623797336

}, {

  fname: "Andrew",

  lname: "Weaver",

  snum: "100376243",

  agrade: 70.01798139244363,

  tgrade: 78.64811561086252,

  egrade: 78.68650242850617

}, {

  fname: "Rhonda",

  lname: "Ford",

  snum: "100296902",

  agrade: 56.14580882764524,

  tgrade: 63.9209865108888,

  egrade: 60.186613967770334

}, {

  fname: "Leonard",

  lname: "Arvan",

  snum: "100220616",

  agrade: 80.67865525396981,

  tgrade: 92.73557717342663,

  egrade: 88.32126970338336

}, {

  fname: "William",

  lname: "Culler",

  snum: "100307637",

  agrade: 65.75251699043244,

  tgrade: 62.18172136246404,

  egrade: 63.065185542933094

}, {

  fname: "David",

  lname: "Nakasone",

  snum: "100353719",

  agrade: 62.63260239883763,

  tgrade: 58.352794766947866,

  egrade: 59.80461902691901

}, {

  fname: "Maria",

  lname: "Young",

  snum: "100311331",

  agrade: 70.13767021264486,

  tgrade: 76.09348747016176,

  egrade: 79.99207130929622

}, {

  fname: "Beverly",

  lname: "Mott",

  snum: "100325579",

  agrade: 83.08140516644137,

  tgrade: 94.80666640692787,

  egrade: 85.15875656837004

}, {

  fname: "Patrick",

  lname: "Francis",

  snum: "100257773",

  agrade: 66.79534616079296,

  tgrade: 47.744928296560076,

  egrade: 64.05723052865763

}, {

  fname: "Tracy",

  lname: "Bonds",

  snum: "100233277",

  agrade: 70.2289028670531,

  tgrade: 65.32258294210156,

  egrade: 77.04816321925091

}, {

  fname: "Richard",

  lname: "Akers",

  snum: "100216705",

  agrade: 52.446722363991015,

  tgrade: 49.205597783687374,

  egrade: 53.72940974941982

}, {

  fname: "Beatrice",

  lname: "Jaco",

  snum: "100233935",

  agrade: 81.89338938644417,

  tgrade: 71.05459078971688,

  egrade: 83.08235397281308

}, {

  fname: "Guy",

  lname: "Wendelin",

  snum: "100336379",

  agrade: 68.17788319655493,

  tgrade: 63.82273085525137,

  egrade: 68.31559946786807

}, {

  fname: "Logan",

  lname: "Olsen",

  snum: "100265736",

  agrade: 59.89037739094347,

  tgrade: 71.76550299333657,

  egrade: 64.61665695830132

}, {

  fname: "Gene",

  lname: "Jeanlouis",

  snum: "100341666",

  agrade: 74.16481515505846,

  tgrade: 68.20592386917109,

  egrade: 78.25975050135006

}];

const result = students

  .filter(student => student.egrade >= 80)

  .map(student => `${student.fname} ${student.lname}`);

  

console.log(result);