getting the value of static method in javascript class

Question

i can't figure it out on how to get the values of a static method of a class. my code is below.

class Field {
    constructor(rows = 11, cols = 10) {
    this.numRows = rows
    this.numCols = cols
    }

    static loadFromFileContents(contents) {
        this.numCols = contents.split('x')[0]
        this.numRows = contents.split('x')[1]

    }
}
const contents = `4 x 5`
const field = Field.loadFromFileContents(contents)
console.log(field.numCols)
console.log(field.numRows)

first of all, i want to get the instance of the static method. something like this instanceof(field), it should be equal to 'Field'. but i don't know if my syntax is correct for getting the instance. Second i want the return value of field.numCols should be equal to 4 because of the first split value and field.numRows should be equal to 5. sorry i'm not that familiar with static method of a class. i hope you can help me with my problem. thank you so much.

yes, mybad i did not notice it. i already fix it

Heihei
– Heihei

2020-03-17 04:27:15 +00:00
Commented Mar 17, 2020 at 4:27 — Heihei
– Heihei, Commented Mar 17, 2020 at 4:27

CertainPerformance · Accepted Answer · 2020-03-17 04:29:01Z

2

It sounds like the static method needs to parse the passed string and return a new Field instance:

class Field {
  constructor(rows = 11, cols = 10) {
    this.numRows = rows
    this.numCols = cols
  }

  static loadFromFileContents(contents) {
    const [rows, cols] = contents.split(' x ');
    return new Field(rows, cols);
  }
}
const contents = `4 x 5`
const field = Field.loadFromFileContents(contents)
console.log(field.numCols)
console.log(field.numRows)

answered Mar 17, 2020 at 4:29

CertainPerformance

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2 Comments

Heihei Over a year ago

wow thanks. it worked. how about this assert.instanceOf(field, Field)? how can i make the instance of the field equal to Field?

CertainPerformance Over a year ago

You can use field instanceof Field, which shows that it resolves to true

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