如何在JavaScript中将数组添加到数组中

Question

How could I achieve this below in JavaScript. I tried searching for it on MDN but couldn't find any method for it.

let a, b
let allNumbers = []

for (a = 10; a < 60; a = a + 10) {
    for (b = 1; b <= 3; b++) {
        allNumbers.push(a + b)
    }
}

The desired outcome is an array inside the allNumbers array:

[[11,12,13], [21,22,23], [31,32,33], [41,42,43], [51,52,53]]

Answer 1

how about this

var a, b
var allNumbers = []

for (a = 10; a < 60; a = a + 10) {
    var part = [];
    for (b = 1; b <= 3; b++) {
        part.push(a + b)
    }
    allNumbers.push(part)
}

Answer 2

Just create a temporary Array in the outer loop and push the elements from the inner loop into it, after the inner Loop is finished, push the temporary array in the main one:

 let a, b let allNumbers = [] for (a = 10; a < 60; a += 10) { let someNumbers = []; for (b = 1; b <= 3; b++) { someNumbers.push(a + b) } allNumbers.push(someNumbers) } console.log(JSON.stringify(allNumbers)) 

Answer 3

You have to use one second array .

 let a, b let allNumbers = [] for (a = 10; a < 60; a = a + 10) { second = []; for (b = 1; b <= 3; b++) { second.push(a + b); } allNumbers.push(second) } console.log(allNumbers); 

You can apply a shorted version using ES6 features.

 allNumbers = [] for (a = 10; a < 60; a = a + 10) { allNumbers.push([...Array(3)].map((_, i) => i + a + 1)) } console.log(allNumbers); 

Answer 4

You can try:

 const result = Array(5).fill(1).map((a, i) => Array(3).fill(1).map((a, j) => +`${i+1}${j+1}`)); console.log(JSON.stringify(result)); 

Answer 5

You have to create a new array an add the element to it in the second loop and the add this array to the final one after the second loop.

 let a, b let allNumbers = [] for (a = 10; a < 60; a = a + 10) { data = [] for (b = 1; b <= 3; b++) { data.push(a + b) } allNumbers.push(data) } console.log(allNumbers) 

Answer 6

You need to declare a second array inside your loop. Like following:

 let a, b let allNumbers = [] for (a = 10; a < 60; a = a + 10) { var tempArray = []; for (b = 1; b <= 3; b++) { tempArray.push(a + b) } allNumbers.push(tempArray); } console.log(allNumbers); 

Answer 7

Just create an array and push the new array int allNumbers :

...
let c = []
for (b = 1; b <= 3; b++) {
    c.push(a + b)
}
allNumbers.push(c)
...