如何使用 JavaScript 在数组内打印数组

Question

The task is to create the following array of arrays in JavaScript:

[
    ["HTML", 4],
    ["CSS", 3],
    ["JavaScript", 10],
    ["React", 5],
    ["Redux", 5],
    ["Node", 4],
    ["MongoDB", 7]
]

It actually printing output but not inside the bracket. Please help.

for(let i = 0; i < webTechs.length; i++){
    arr.push(webTechs[i], webTechs[i].length)
}
console.log(arr)

Answer 1

As what you're expecting is an array of arrays, you need to push the elements as arrays themselves:

    for(let i = 0; i < webTechs.length; i++){
        arr.push([webTechs[i], webTechs[i].length]) //Notice the [] to push them as array into 'arr'
    }

Answer 2

arr.push([webTechs[i], webTechs[i].length]) this is what you are looking for i guess.

EXPLANATION

• arr.push("a","apple") ==> ["a","apple"]

BUT

• arr.push(["a","apple"]) ==> [["a","apple"]]

USING JSON.stringify