/**
* @param array such as [1024, 2048, 20480, 102400]
* @param unit such as M
* @return return proper unit from units
*/
var units = ['M', 'G', 'TB', 'PB'];
function solveUnit(array, unit) {
var power, unitIndex;
var lastChooseIndex = units.indexOf(unit);
for(var i = 0, len = array.length; i < len; i++) {
power = 1024; // set back to 1024
unitIndex = units.indexOf(unit);
while(Math.floor(array[i] / power) > 100 ) {
unitIndex++;
power = power * power;
}
if(unitIndex > lastChooseIndex) {
lastChooseIndex = unitIndex;
}
}
return units[lastChooseIndex];
}
function formatArray(array, unit, _get) {
if(unit == _get) {
array.forEach(function(item) {
console.log(item + ''+unit);
});
return array;
}
var gap = units.indexOf(_get) - units.indexOf(unit);
var power = 1024;
while(gap>1) {
power = power * power;
gap--;
}
var ret = array.map(function(item) {
console.log( (item/power).toFixed(1) + '' + _get );
return (item/power).toFixed(1);
});
return ret;
}
// test
var array = [112640, 141312];
var unit = 'M';
var _get = solveUnit(array, unit);
formatArray(array, unit, _get);
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