How to use 'javascript add numbers in array' in JavaScript

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function writeNumbers(array) {
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    var i = 0;
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    while (i < array.length) {
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        // Assume the array's length is evenly divisible by 10 to avoid length
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        // check overhead.
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        array[i++] = i;
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        array[i++] = i;
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        array[i++] = i;
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        array[i++] = i;
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        array[i++] = i;
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        array[i++] = i;
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        array[i++] = i;
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        array[i++] = i;
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        array[i++] = i;
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        array[i++] = i;
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    }
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    return i;
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}

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function toNumber(arr) {
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	for (var i = 0; i < arr.length; i++) {
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		arr[i] = Number(arr[i]); 
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	} 
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	return arr; 
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}