I have a function that has an array with the months of the year. In my function i delete some words of the month name. My function is
var array = ['Enero', 'Febrero', 'Marzo', 'Abril', 'Mayo', 'Junio', 'Julio', 'Agosto', 'Septiembre', 'Octubre', 'Noviembre', 'Diciembre']; for (var i = 0; i < array.length; i++) { var result = [array[i].slice(0, 3)]; console.log(result); }
The result is ["Ene"] ... ["Dic"]
But i want have some like this: ["Ene", ... , "Dic"]
How i can concat the result in a unique array?
Problem:
In OP code, the statement
var result = [array[i].slice(0, 3)];
is creating a variable result
in each iteration of the for
loop and assigning an array having one element in it, so after loop finishes execution, the result
variable will only contain the last element ["Dic"]
.
Solution:
To add the elements to array, use Array#push
.
var array = ['Enero', 'Febrero', 'Marzo', 'Abril', 'Mayo', 'Junio', 'Julio', 'Agosto', 'Septiembre', 'Octubre', 'Noviembre', 'Diciembre']; // Declare new empty array var result = []; // Loop over main array for (var i = 0; i < array.length; i++) { // Add the new item to the end of the result array result.push(array[i].slice(0, 3)); } console.log(result);
Use Array#map
var array = ['Enero', 'Febrero', 'Marzo', 'Abril', 'Mayo', 'Junio', 'Julio', 'Agosto', 'Septiembre', 'Octubre', 'Noviembre', 'Diciembre']; var months = array.map(function(e) { return e.substr(0, 3); }); console.log(months);
Have result
be an empty array and push()
to it.
var result = []; var array = ['Enero', 'Febrero', 'Marzo', 'Abril', 'Mayo', 'Junio', 'Julio', 'Agosto', 'Septiembre', 'Octubre', 'Noviembre', 'Diciembre']; for(var i=0; i<array.length; i++){ result.push(array[i].slice(0,3)); } console.log(result);
The slice() method returns the selected elements in an array, as a new array object. - http://www.w3schools.com/jsref/jsref_slice_array.asp
The substr() method extracts parts of a string, beginning at the character at the specified position, and returns the specified number of characters. - http://www.w3schools.com/jsref/jsref_substr.asp
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