os0x (owner)

Revisions

gist: 207871 Download_button fork
public
Description:
4文字に収めたいときがある
Public Clone URL: git://gist.github.com/207871.git
Embed All Files: show embed
JavaScript #
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function abbr_exp_notation(count, i){
	if (count < Math.pow(10, i)) {
		return Math.floor(count / Math.pow(10, i-2)) + 'e' + (i-2);
	} else {
		return abbr_exp_notation(count, ++i);
	}
}
/*
console.log([
Number(abbr_exp_notation(21,1)) === 21,
Number(abbr_exp_notation(321,2)) === 320,
Number(abbr_exp_notation(4321,3)) === 4300,
Number(abbr_exp_notation(54321,4)) === 54000,
Number(abbr_exp_notation(654321,5)) === 650000,
]);
console.log([
abbr_exp_notation(21,1) === '21e0',
abbr_exp_notation(321,2) === '32e1',
abbr_exp_notation(4321,3) === '43e2',
abbr_exp_notation(54321,4) === '54e3',
abbr_exp_notation(654321,5) === '65e4',
]);
*/