Question 260899 in Javascript Question posted in
A very good W3school tutorial can be found here.

Javascript – how can I write my own push method WITHOUT using any array methods?

for this test, it should works, but i don’t know what’s wrong

i don’t know why , but in webstorm it is working, but on course website no, i guess on website there is other return structure, and i should add this. somewhere, but i don’t know where.

It looks like your post is mostly code; please add some more details. thank you stack overflow, but i want to post my question

it(`Push method should work with many items

input: [1, 2, 3].push(72, 12, 41)`, () => {
    const source = [1, 2, 3];
    source.push2(72, 12, 41);

    expect(source)
      .toEqual([1, 2, 3, 72, 12, 41]);
});

source.push2 = function(...param){

  const parameters = [...param];
  for (const item of parameters) {
    source[source.length] = item;
  }

  return source;
};
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2

Answers


  1. 0

    You mean something like below

    Array.prototype.push2 = function(...args) {
  for (const arg of args) {
    this[this.length] = arg;
  }
  return this.length;
};

const myArray = [1, 2, 3];

myArray.push2(72, 12, 41);
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  2. 0
    1. You should use this
    anotherArray.push2 = source.push2;
anotherArray.push2(1) // pushes 1 into *source*
    1. You should use Array.prototype
    anotherArray2.push2(1) // error: anotherArray2 doesn't have .push2
Array.prototype.push2 = source.push2
anotherArray2.push2(1) // ok
    1. You should return length
    console.log(['a','b','c'].push('d')) // 4
console.log(['a','b','c'].push2('d')) // ['a','b','c','d']
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