kuanyingchou · November 8, 2015 19:01
diff --git a/update.js b/update.js
 let a = [1, 2, 3, 4, 5];
 let index = 2;
 let inc = i => i+1;
 let dec = i => i-1;
 let b = [...a.slice(0, index).map(inc), dec(a[index]), ...a.slice(index+1).map(inc)];
 console.log(`a=[${a}]`);
 console.log(`b=[${b}]`);
	let a = [1, 2, 3, 4, 5];
	let index = 2;
	let inc = i => i+1;
	let dec = i => i-1;
	let b = [...a.slice(0, index).map(inc), dec(a[index]), ...a.slice(index+1).map(inc)];
	console.log(`a=[${a}]`);
	console.log(`b=[${b}]`);