New library additions

#New string methods

"hello".repeat(3)
"hello". includes("ll")
"hello". startsWith("he")
"hello".padStart(8)     // "hello"
"hello".padEnd(8)       // "hello"
"hello".padEnd(8, '!')  // hello!!!
"\u1E9B\u0323".normalize("NFC")

#New Number Methods

Number.EPSILON
Number.isInteger(Infinity) // false
Number.isNaN("NaN")         // false

#New Math methods

Math.acosh(3)    // 1.762747174039086
Math.hypot(3, 4)  // 5
Math.imul(Math.pow(2, 32) -1, Math.pow(2, 32) -2) // 2

#New Array methods

//return a real array
Array.from(document.querySelectorAll("\*"))
//similar to new Array(...), but without the special single-argument behavior
Array.of(1, 2, 3)

See: New library additions