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x=>x+1// similar to function(x) {return x + 1;}(x,y)=>x+y// similar to function(x, y) {return x + y;}x=>{returnx+1}
Array destructuring
var[x,,y]=[1,2,3];// x === 1, y === 3var[x]=[];// x === undefinedvar[x=1]=[];// x === 1 (default value)var[x,y,z]="xyz";// x === "x", y === "y", z === undefinedvar[a, ...b]=[1,2,3];// a === 1, b === [2, 3]var[a, ...b]=[1];// a === 1, b === []
Object destructuring
var{x,a:y, z}={x: 1,y: 2};// x === 1, a === 2, z === undefined
Default function parameters
function(a=1,b=2){...}function(a,b=a){...}// default can be previous param
Rest parameters
function(a, ...b){...}// b will be an array containing the 2nd and above params
Template strings
varx=1,y='hello';`${y}! x + 1 = ${x+1}`// === "hello! x + 1 = 2"