more js code_wars

bovas85 · Feb 8, 2016 · 11e2a70 · 11e2a70
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diff --git a/Js/formatting_decimals.js b/Js/formatting_decimals.js
@@ -0,0 +1,13 @@
+function twoDecimalPlaces(n) {
+  return Math.round(n * 100) / 100
+}
+
+// or
+
+function twoDecimalPlaces(n) {
+  return parseFloat(n.toFixed(2));
+}
+
+twoDecimalPlaces(4.659725356); //, 4.66
+
+twoDecimalPlaces(2.675); //, 2.68
diff --git a/Js/regex_match_0-9.js b/Js/regex_match_0-9.js
@@ -0,0 +1,17 @@
+String.prototype.digit = function() {
+  return /^\d$/.test(this);
+};
+
+// mine is below
+
+
+String.prototype.digit = function() {
+  if (/[a-z\s]/gi.test(this)) return false;
+  if (this>9) return false;
+  return /[0-9]/g.test(this);
+};
+
+''.digit() // , false);
+'7'.digit() // , true);
+' '.digit() //, false);
+'14'.digit() //, false);
diff --git a/Js/validate_regex_beginning.js b/Js/validate_regex_beginning.js
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+function validateCode(code){
+    return /^1|^2|^3/g.test(code);
+}
+
+// or
+
+function validateCode(code){
+    return /^[123]/.test(code);
+}
+
+
+validateCode(123); // true
+validateCode(321); // true
+validateCode(421); // false