Simplify check for -0 in printNumber (#5581)

Connormiha · cpojer · commit 0285e63e903a · 2018-02-16T08:56:19.000Z
diff --git a/packages/pretty-format/src/index.js b/packages/pretty-format/src/index.js
@@ -80,11 +80,7 @@ function isToStringedArrayType(toStringed: string): boolean {
 }
 
 function printNumber(val: number): string {
-  if (val != +val) {
-    return 'NaN';
-  }
-  const isNegativeZero = val === 0 && 1 / val < 0;
-  return isNegativeZero ? '-0' : '' + val;
+  return Object.is(val, -0) ? '-0' : String(val);
 }
 
 function printFunction(val: Function, printFunctionName: boolean): string {

Original file line number	Diff line number	Diff line change
`@@ -80,11 +80,7 @@ function isToStringedArrayType(toStringed: string): boolean {`
`80`	`80`	`}`
`81`	`81`
`82`	`82`	`function printNumber(val: number): string {`
`83`		`- if (val != +val) {`
`84`		`- return 'NaN';`
`85`		`- }`
`86`		`- const isNegativeZero = val === 0 && 1 / val < 0;`
`87`		`- return isNegativeZero ? '-0' : '' + val;`
	`83`	`+ return Object.is(val, -0) ? '-0' : String(val);`
`88`	`84`	`}`
`89`	`85`
`90`	`86`	`function printFunction(val: Function, printFunctionName: boolean): string {`