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insertar al inicio de un array javascript

var arr = [1, 2];

arr.unshift(0); // resultado de la llamada es 3, la nueva longitud del array
// arr es [0, 1, 2]

arr.unshift(-2, -1); // = 5
// arr es [-2, -1, 0, 1, 2]

arr.unshift([-3]);
// arr es [[-3], -2, -1, 0, 1, 2]

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insertar al inicio de un array javascript

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