added truncate() method to Utility

src/transform.js

@@ -314,8 +314,8 @@ function stretch(a=[0], len=5, mode='linear'){
 		// construct a lookup interpolation position for new array
 		let val = i / (len - 1) * (l - 1);
 		// lookup nearest neighbour left/right
-		let a0 = a[Math.max(Math.floor(val), 0)];
-		let a1 = a[Math.min(Math.floor(val)+1, l-1)];
+		let a0 = a[Math.max(Math.trunc(val), 0)];
+		let a1 = a[Math.min(Math.trunc(val)+1, l-1)];
 		// interpolate between the values according to decimal place
 		arr.push(Util.lerp(a0, a1, val % 1));
 	}

src/utility.js

@@ -260,6 +260,21 @@ function mod(a, mod=12){
 }
 exports.mod = mod;
 
+// Truncate all the values in an array towards 0,
+// sometimes referred to as rounding down
+// 
+// @param {Number/Array} -> input value
+// @return {Int/Array} -> trucated value
+function truncate(a){
+	if (!Array.isArray(a)){
+		return Math.trunc(a);
+	}
+	return a.map(x => Math.trunc(x));
+}
+exports.truncate = truncate;
+exports.trunc = truncate;
+exports.int = truncate;
+
 // Plot an array of values to the console in the form of an
 // ascii chart and return chart from function. If you just want the 
 // chart returned as text and not log to console set { log: false }.

test/serialism.test.js

@@ -76,18 +76,15 @@ markov.clear();
 console.log(markov.table);
 */
 
-// let arr = [0, 12, 4, 9];
-let arr = Rand.random(4, 0, 24);
+let arr = [0, 9, 3, 19, 7];
+// let arr = Rand.random(4, 0, 24);
 console.log(arr);
 Util.plot(arr);
 
-let res = Mod.stretch(arr, 30);
+let res = Util.trunc(Mod.stretch(arr, 15));
 console.log(res);
 Util.plot(res);
 
-// console.log(Util.lerp(0, 10, 0.9));
-// console.log(Util.mix(0, 10, 0.9));
-
 // fullTest();
 
 function fullTest(){