JavaScript: Array.prototype.push
arrayX.push(new1, new2 etc)
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Adds items to the end of the array arrayX. Return the new length.
const xx = [3]; const xy = xx.push(7, [8]); console.log(xy === 3); console.log(JSON.stringify(xx) === "[3,7,[8]]");
To join arrays by flattening 1 level, see Array.prototype.concat .
To flatten nested array, see Array.prototype.flat .